GENUS CENTRAL™ AT CULTIVAR.ORG
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Genera Panicum - Papaver - Pardancanda - Parrotia - Passiflora - Parthenocissus - PaulowniaPelargonium - Pennisetum - Penstemon - Peperomia - Perovskia - Persicaria - Petunia - Phellodendron - Philadelohus - Philodendron - Phlox - Phormium - Physocarpus - Physostegia - Picea - Pinus - Platycladus - Polocarpus - Podophyllum - Polemonium - Punica - Pyracantha - Pyrus - Quercus - Ranunculus - Rhapiolepis - Rhodendron-AzaleaRhus - RobiniaSalix - Salvia - Sambucus - Sanseveria - SarraceniaSaururus - Schizachyrium NEW - Sciadopitys - Sedum - Selaginella - Sequoia/Sequiadendron - Sempervivum/Jovibarba - Smilacina - Solidago/xSolidaster - Sophora - Sorbus - Spiraea - Stachyrus - Stokesia - Styrax - Syringa - Taxodium - Taxus - ThalictrumThuja - Thymus - Veronica - Viburnum - Viola - Vitex NEW - Weigela - Yucca - Zelkova  NEW - Zephranthes

GENERA I - O : GENERA A to H
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Your computer, tablet, phone, or book reader can have the latest cultivar encyclopedia for each genus in handy PDF form - the most complete cultivar references for more than 103 ornamental, landscape genera. CULTIVAR.ORG is a product of more than 35 years of work by leading horticultural taxonomist Larry Hatch and the hundreds of experts in the New Ornamentals Society and our experts partners around the world. We exceed your familiar plant manuals, horticultural society "complete" guides, and most websites by 3-20 times more cultivars and with much more specific, detailed data. For example, 159 Aucuba cultivars, 191 Astilbe, 274 Aquilegia, 109 Ajuga, 1032 Acer, 59 Abelia, 175 Aglaonema, and 103 Aesculus. Click logo above for more details.

If you prefer to purchase volumes separately our Google Play Books Store has many of the same files for $7.20 to $20.00 each. CULTIVAR.ORG is however about 60% less expensive since you are mass-purchasing access at the Preferred Library Rate.

GENUS ALL RESOURCES
Pachysandra

Jan de Lange
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PACH002 - Pachysandra terminalis 'Cutleaf' (Raulston Arboretum, summer 2014).


PACH001 -  Pachysandra axillaris 'Windcliff Fragrant' (Monrovia)
PACH002 - Pachysandra terminalis 'Cutleaf' (Raulston Arboretum, summer 2014)
PACH003 - Pachysandra terminalis 'Tiffany'. Plantdelights.com, accessed 4.15.2015

 PACH004 -Pachysandra axillaris 'Windcliff Fragrant' (Monrovia, Dan Hinkley)
----end of OROC

Your computer, tablet, phone, or book reader can have the latest cultivar encyclopedia for each genus in handy PDF form - the most complete cultivar references for more than 103 ornamental, landscape genera. CULTIVAR.ORG is a product of more than 35 years of work by leading horticultural taxonomist Larry Hatch and the hundreds of experts in the New Ornamentals Society and our experts partners around the world. We exceed your familiar plant manuals, horticultural society "complete" guides, and most websites by 3-20 times more cultivars and with much more specific, detailed data. For example,  738 Juniperus cultivar (the most ever), 174 Nephrolepis, 41 Metasequoia, 335 Lavandula, 60 Nandina, 102 perennial Lobelia, and 427 Hedera helix with lavish, original scans of 1984-2014 cultivar intros.

 Please click the logo above for details.

If you prefer to purchase volumes separately our Google Play Books Store has many of the same files for $7.20 to $20.00 each. CULTIVAR.ORG is however about 60% less expensive since you are mass-purchasing access at the Preferred Library Rate.
Paeonia

Flora of China

American Peony Bookstore (plant society website, bookstore)  - numerous books with cultivar data

The Peony Database - Carsten Burkhardt's Web Project Paeonia (specialy interest database) - a very impressive work covering both herbaceous and suffruticose/tree taxa.

The Peony by Coit (PDF ebook, Google Books, Cornell University) - 1908 classic and still interesting. The third book on Classication of the Peony by Batchelor (1910) expanded the checklist and was a joint work of the American Peony Society and Cornell's Department of Horticulture.

A Peony Manual by Harrison (1907)(PDF ebook, Google Books) is from the same Charles Harrison who wrote The Phlox Manual.




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Panicum
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PANI001 Panicum virgatum 'Cape Breeze' (Google Patents)
Papaver -
annual species

Poppies by Christopher Grey-Wilson (printed book, Amazon) - a stunning and useful monograph, covering Papaver and so many related genera. Highly recommended by the cultivar.org staff.

Papaver
orientale,
it's hybrids, and other
perennials

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x Pardancanda
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PARD001 - x Pardancanda 'Wine and Yellow Roses' - 36 in. tall. Flowers made of 6 tepals, alternating 3 yellow with purple to violet-red margins, alternating with three others of this same purple to violet-red coloration. Seed strain so plants will vary.
Parrotia



PARR001 Parrotia persica 'Keith Silver' NEW CULTIVAR NAME (June 25,. 2014) (Charles R. Keith Arboretum) - more upright, multiple trunks all crowded and erect,  and bark in silvery, gray, and greenish-grey tones, lacking the browns, tawny, and flesh tones of most species material. Photo above no part of OROC Data Sharing


PARR002 - Parrotia persica 'Persian Lace'


Parrotia persica 'Bella' (Bluebell Nursery) - same as 'Belle' of Junker's Nursery?

Parrotia persica 'Golden Belltwower' - neatly columnar over many years. Leaves golden-yellow to orange and yellow in fall, very showy.
Parthenocissus

PART001 Parthenocissus tricuspidata CALICO CAT™ (Upshoot) - a tricolored variegated, bright pink new shoots and older leaves green mottled in white bit. Photos show both compound and simple leaves.
PART002 Parthenocissus tricuspidata 'Grand Slam'. Habit vigorous, strong. Leaves richer red shades in fall  than typical.  Songsparrow.com, accessed 4.11.2015.


PART003 Parthenocissus quinquefolia RED WALL™ blended nicely with PART 004 YELLOW WALL™.  Click image to enlarge. Photo courtesy of and owned by www.provenwinners.com
Passiflora
Passiflora: Passionflowers of the World by Ulmer and MacDougal (book, Amazon) - covers 207 species, 31 hybrids

Passifloras for Your Garden by Knock (book, Amazon)

Passion Flowers by Van der Plank (book, Amazon) - written by the UK NCCPG holder. This 2000 is best but a 1996 edition is also sold.

Passiflora Society International (plant society website)

Passiflora Online (special interest website)
Paulownia

Flora of China
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Pedilanthus
PEDI001 - Pedilanthus macrocarpus 'Chilly Willy' (Civano Nursery)
Pelargonium -
Flowering and
Zonal

Geraniums: The Complete Encylopedia by Brawner (book, Amazon) - not only many useful photos but history of cultivars and their breeding history

The Joy of Geraniums by van Pelt Wilson (book, Amazon) - the book credited with bringing on the modern revival of the genus in gardens, at least for the US.

Geraniceae Group Booklist (society website)

Pelargoniums: An Illustrated Guide to Varieties, Cultivation, and Care by Cooke (book, RHS) - released August 2013-

Fibrex Nurseries (nursery website, reference catalog) - more than 2000 cultivars make this a splendid guide

FANTASIA DARK RED (Ball Flora) - the darkest red zonal available today


Penn State Trial Gardens Report (university website, trial gardens, cultivar evaluation) - 777 cultivars - an outstanding study with images

Pelargonium -
Scented Leaf

Big Book of Herbs by Tucker and deBaggo (book, Amazon) - I could never understand the ID and nomenclature of scented Pellies until studying this reference. The key, species descriptions, and cultivar notes are priceless.

Scented Geraniums by Becker (book, Amazon)

298 cultivars + more species, one of the most complete culivar checklists on the group and also some very nice, detailed images shot in Nikon digital clarity. We spent almost 3 years buying plants, studying literature, checking and revising names, and assembling data from some of the best herb gardens in the eastern US.


An assortment of taxa we grew at the New Ornamentals Society (Cultivar.org) to create our checklist. This was a flatbed, very high-res scan of 12000 pixels in the original version but we had to cut it down so it doesn't take 15 minutes to display! Click image to enlarge.
Pennisetum

Utah State University Herbarium
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P. purpureum 'Prince' and 'Princess'

    54
ornamental
only


PENN001 - Pennisetum alopecuroides 'Ginger Love' - 2-3 ft. tall x wide. Inflorescence thick, red. Intrinsicperennials.com , accessed 4.14.2015
PENN002 - Pennisetum alopecuroides PRAIRIE WINDS™ 'Desert Plains' - 3-4 ft. tall x wide, urpgiht vasey, neater than most existing clones. Leaves green, becoming rich red in fall, having some orange tones too. Flower heads 5 in. long, smoky-purple at first, becoming tan.  Selected by Gary Trucks, Amber Wave Gardens, Michigan, USA as improved 'Cassian' seedling.US Patent #20751.
PENN003 - Pennisetum alopecuroides 'Penalope' - 50cm tall, 80cm in flowers. Flower panicles rich brownish-red, showy, much larger than typicasl. Selected by Jan Spruyt, vasteplant.be, accessed 5.16.2015
--end of OROC Data Sharing
Penstemon

American Penstemon Society

PENS001 - Penstemon 'Kissin Kuzins' (Plant Delights, new 2015)
PENS002 - Penstemon CHA CHA™ CHERRY - 24-28 in. tall, vigorous. Flower corolla true cherry red, a bright shade, from very dark, baclkishp-red or dark cherry red, throat pinkish with stripes of red, very floriferous.Terranovanurseries.com, accessed 4.12.2015
--end of OROC Data Sharing


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Perovskia RHS 2011 Trial Report (PDF)

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Peperomia

HITS (House, Interior, Tropical, Succulent) Plants by Hatch - 2013-15 Early Preview Edition (PDF ebook, 400+ pages leading to 1300 pages in 2017) 64 cultivars, including modern images and historical scans of old articles and nursery ads describing our classic cultivars.


The Internet Peperomia Reference - Peperomia.net (special interest website, gallery)


PEPE001 - Peperomia 'Eden Rosso' 
PEPE002 - Peperomia argyreia 'Diamond Nebula' (New Ornamentals Society)
---end of OROC Data Sharing
 - the photo below may NOT be extracted and used with OROC Data Sharing.
Pentas


Penn State Trioal Gardens Report (university website, trial gardens, cultivar evaluation)
Perilla
NODabp (New Ornamentals Database - Annual Bedding Plants) - (PDF ebook, New Ornamentals Society)

Perovskia
PERO001 - Perovskia atriplicifolia 'Denim 'n Lace' - 28-32 in. tall x 34-38 in. wide, compact, semi-dwarf, stronger and more upright than older cultivars. Flowers faded denim blue (near sky blue) to lavender-blue effect due to purplish or amethyst calyx. Leaves appear more incised, lacy in appearance. Perennialresource.com, accessed 5.26.2015
--end of OROC Data Sharing

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Persea
excluding
Asian
Machilus


Original cultivar.org key by Larry Hatch
Petasites
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Persicaria Cotswold Garden Flowers - easily the best assortment on the market


PERS001 - Persicaria amplexicaule 'JS Caliente' - 50cm tall, 70cm tall in flower, corolla dusky orangish-red, richly toned. Selected by Jan Spruyt, vasteplant.be, accessed 5.17.2015
PERS002 - Persicaria amplexicaule 'JS Calor' - 60cm tall, 90cm tall in flower, corolla rich, warm cherry red. Selected by Jan Spruyt, vasteplant.be, accessed 5.17.2015
PERS003 - Persicaria amplexicaule 'JS Delgado Macho' - 35cm tall, 50cm tall in flower, a shorter clone than others,  corolla rich pinkish-red to medium red. Selected by Jan Spruyt, vasteplant.be, accessed 5.17.2015
PERS004 - Persicaria amplexicaule 'Betty Brandt' - 60cm tall, 80cm tall in flower, corolla pinkish-lilac. Selected by Jan Spruyt, vasteplant.be, accessed 5.17.2015, JS« trademark external to cultivar name, applied to many genera, not specific to this genus.
PERS005 - Persicaria amplexicaule 'Sangre' - 80cm tall, 100cm tall in flower, corolla rich cherry-red, some pinkish tones, very bright. Selected by Jan Spruyt, vasteplant.be, accessed 5.17.2015, JS« trademark external to cultivar name, applied to many genera, not specific to this genus.
PERS006 - Persicaria amplexicaule  SEVEN OAKS VILLAGE - 50cm tall, 90cm tall in flower, corolla pink and white in one head, subtle bicolor. Selected by Jan Spruyt, vasteplant.be, accessed 5.17.2015, JS« trademark external to cultivar name, applied to many genera, not specific to this genus.
--end of OROC Data Sharing
Petunia NODabp (New Ornamentals Database - Annual Bedding Plants) - (PDF ebook, New Ornamentals Society)

Coming up in 2015-2016...these new spreadsheet/database covers 3 centuries of varieties....please send your own new cultvar data to ornamentals @  lycos.com.


Petunia x hybrida 'Sophistica Blackberry' (Burpee) - closed to a real black color yet - awesome next to a cream or yellow variety

SUPERTUNIA« (Proven Winners)



1412 taxa, most cultivars (10 September 2013)


USDA-ARS - Genetic improvement


Petunia x hybrida 'Pretty Much Picasso' takes the Multiflora magenta look and adds a true lime green margin. Despite what the shallow, ungrounded garden writers write about this today, green-margined petunia are not a modern, genetic breakthrough and in fact occured back in 1855 and by images may have had a wider edge than this cultivar today. Everything old is new again....click image please.
Phalaris
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Phellodendron

Original Cultivar.org key by Larry Hatch
Philadelphus

PHIL001 - Philadelphus 'Dainty Lady' - 2.5m tall x 1.5m wide, not dwarf, upright, narrowly spreading, more suitable for small gardens than older cultivars. Leaves narrowly ovate, green, tinged maroon at first. Flowers white, very numerous, very hightly scented, calyx green to maroon, contrasting very nicely in young flowers, raceme inflor. 3.6cm long x 5.4 cm wide, individual flowers to 3.5cm wide. US Plant Patent #24536 to Peter R. More on June 10, 2014 as cross of P. microhyllus x P. delvavyi var. calvescens in 1995.
--end of OROC Data Sharing
Philodendron
HITS (House, Interior, Tropical, Succulent) Plants by Hatch - 2013-15 Early Preview Edition (PDF ebook, 400+ pages leading to 1300 pages in 2017)


Exotica 4 by Graf (book, Amazon) - this oldie remains the standard for Philodendron cultivars and species comparisons.

International Aroid Society - Cultivar Database Listing by Burch (website, plant society, ICRA cultivar register) - official cultivar register


ebay often lists new sports, very rare cultivars before the big commercial growers get them. Some are so rare and niche market they are one or two or 100 of a kind.



'Frilly Philly'
Philotheca
Phlomis
Phlomis by Taylor (lPDF ebook, Lulu) - a quality reference from an NCCPG holder. There is also a paperbook version: Phlomis by Taylor (paperback book, Lulu)
Phlox -
Annual or
Tender -
P. drummondii



Penn State Trial Gardens Report (university website, trial gardens, cultivar evaluation) - 64 cultivars
Phlox -
Hardy or
Perennial

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The 940 cultivar desciprtive checklist can also be purchased from...



Phlox: A Natural History and Gardeners Guide by Lochlear (book, Google Books) - very valuable work on this genus.

Manual on the Phlox by Harrison (PDF ebook, Google Books) - this work is off the radar for most perennial experts but the cultivar listings and depth of knowledge are simply stunning.

A Comparative Study of Phlox paniculata Cultivars by Hawke (botanic garden website, plant evaluation, cultivar trials) - the usually thorough CBG eval of the best cultivars, new and old.

Primose Path: Phlox: An Exploration: Phlox Species and Cultivars (nursery catalog website) - a lovely illustrated study with lots of original content.




The previous 940 cultivars are found in Hatch's Perennials.
PHLO001- Phlox pulchra 'Bibb Pink'
PHLO002 - Phlox glaberrima var. triflora 'Forever Pink'. Plantdelights.com, accessed 4.15.2015
PHLO003 - Phlox x procumbens 'Pink Profusion'. Plantdelights.com, accessed 4.15.2015
PHLO004 - Phlox pilosa 'Bungalow Blue' - 15-18 in. tall. Flower head dense, domed, corolla light blue to pa,le lavender-blue, less a lavender-pink compared to species, each petal with two dark purple basal markings. US intro 2014.
---end of OROC Data Sharing


USDA-ARS-OPGC-Ohio State - Flower pigment genetics with 400 accessions including 240 wild-collected accessions
Phormium
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Checklist of Phormium Cultivars by Heenan (book)

Origins and History of the Dunedin Botanic Garden Phormium Collection by Star, Lowe, Carr, McCallum, and Myers (Royal New Zealand Institute of Horticulture, PDF article)

Fernwood Nursery - Phormium Cultivar List (nursery website, checklist)


'Blondie' (Plant Haven)
SWEET MIST«
FLAMIN«
Photinia

Flora of China
44 cultivars (PDF ebook, New Ornamentals Society)



Hatch's Cultivars of Woody Plants is our standard for 44 existing cultivars in this genus.
PHOT001 - Photinia fraseri MAGICAL VOLCANO 'Kolmavoca' - much as 'Red Robin' with dark glossy red new growth but adds a highly undulate, serrulate to Ilex-like spinose, toothy blade that provides more  texture and interest. European trade c. 2000.
--end of OROC Data Sharing
Phygelius
Phyllostachys
Physocarpus
P. opulifolius 'Donna May'


COPPERTINA™ (Proven Winners)

.


PHYSOC001 - Physocarpus o. AMBER JUBILEE™ (First Edition Plants)

PHYSOC002 - Physocarpus opulifolius LITTLE ANGEL™ 'Hoogi016' - young plants 50cm tall x 30 cm wide, very low, compact. Flowers near white. Leaves rich "wram red". Euro PBR 20141961 by G. Hoogenraad, Netherlands.

PHYSOC003 - Physocarpus GUMDROP™ BURGUNDY COTTON 'Podaras 1'  - 48-60 in. tall x 36-50 in. wide. Habit compact. Mildew resistant. Leaves copper-red at first,soon becoming dark burgundy red, red persisting until fall. Peter Podaras US Patent #22361. Ballseed.com, accessed 4.20.2015 under unknown species "Physocarpus hybrida", presumed here to be P. opulifolius.

PHYSOC004 - Physocarpus GUMDROP™ CARAMEL CANDY 'Podaras 2'  - 24-30  in. tall x 36-4 in. wide. Habit compact.  Leaves caramel brown becoming green in time, more persistant caramel tones. Peter Podaras US Patent #22363. Ballseed.com, accessed 4.20.2015 under unknown species "Physocarpus hybrida", presumed here to be P. opulifolius, sometimes on this on the website spelled CARMEL.

PHYSOC005 - Physocarpus GUMDROP™ LEMON CANDY 'Podaras 3'  - 48-60 in. tall x  48-60 in. wide. Habit compact.  Leaves bright yellow, becoming chartreuse or slightly greener, "freaky fluorescent gold" (BallHort),generally yellow shades persistant until fall. Peter Podaras US Patent #22362. Ballseed.com, accessed 4.20.2015 under unknown species "Physocarpus hybrida", presumed here to be P. opulifolius

PHYSOC006 - Physocarpus opulifolius 'Golden Anny'leaves margined yellow and chartreuse and highly sectored as well, 50-65% surface, often just a small central tree of light green, or alternatively 2-3 small trees of that color along the major lobe axises, some plants, perhaps shaded ones appears nearly all chartreuse or all gold with only subtle markings.  Selected by Jan and Anny Bos, Wilp, The Netherlands, Eur. PBR #33556.


PHYSOC007 - Physocarpus opulifolius MIDNIGHT™ 'Jonight' - 1.8 m tall x 1.5 m wide, medium growth rate, bushy. Flowers near white, contrasting much with the folliage./ Leaves very dark blackish-purple to dark reddish-purple, much darker and less red than 'Diablo' or 'Mindia', the darkest known leaf color to date (May 2015). Fruits red, showing, contrasting also with flowers and foliage. Seedling of 'Diablo' by John Jones, Hybrid Plant Nurseries, England, Eur PBR 1574 in 2013.
--end of OROC Data Sharing
Physostegia
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PHYS001 - Physostegia virginiana 'Pink Manners' (Plant Delights)
Phytolacca
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Phytolacca americana 'Silberstein' - the pretty weed with a hazy, pale look all it's own. Useful in the right spot.

Phytolacca americana 'Sunny Side Up' (Plant Delights)
Picea

Jan de Langhe
RHS Encyclopedia of Conifers (book) - numerous cultivars and stunning photographs

All spruce species and their cultivars are now compiled into one file as of 1.13.2016

The Conifer Treasury 5.0 by Mesterhazy (website, cultivar checklist) - very large, impressive checklist of cultivar with links to Google photos and thousands of original photos, much of the cultivar not in British and US conifer literature.



1. Variations of Picea pungens by Hatch (youtube video, plant society website)

2. Picea pungens 'Baby Blue Eyes' by TNSMINC



It is the policy of OROC to refuse named registration of recently found, unpropagated, or not commercially available witches brooms; most of which are sure to become lost and never part of the trade or collections. Thousands of such names proliferate in modern conifer literature and seem only to serve as nomenclatural place holders and numerical tools to raise the honor of specific nurserymen and collectors whose material differs not one bit from existing brooms. While some broom collectors like Sidney Waxman and Jerry Morris have distinguished themselves with unique combinations of broom traits, truly useful dwarf creations, and naming clones with care and moderation, others persist in naming every single broom, unique, propagated, or not. We will register resemblant brooms if proven to be in the commerical trade.
---
PICE001 - Picea engelmannii 'Albert's Cousin' ('Albert's Cousine') - more densely pyramidal, same form as the famous Picea pungens 'Fat Albert', hence appearing to be it's cousin in another species. Selected by Paul Warnick, University of Idaho Arboretum.

PICE002 - Picea engelmannii 'Sweetwater' - narrowly columnar, hanging limbs.

PICE003 - Picea abies 'Catharine's Golden Heart' - 2 ft. tal x 3 ft. wide (10 years), mounded and spreading, not always dense. Leaves golden-yellow. Female strobili red, showy, borne on young plants. Selected by Bon Fincham.

PICE004 - Picea glauca 'Lion Mane' - 2-4 ft. tall x wide (10 years). Leaves typical bluish0-green but brightly accented yellow. Josef Braeu found near the lion pen of an undisclosed zoo.

PICE005 - Picea glauca 'Achat' - as 'Conica' but more compact, slower, fine-textured, 2-4 inl a year or less, and with pale yellow new tips which are green by early summer. Iseli Nursery. intro. 2014-15.

PICE006 - Picea glauca 'The Limey' - fairly typical, open pyramidal species form. Leaves with new tips bright lemon-lime, more yellow with age, interior a dark lime green, finally darker green. Iseli Nursery, intro. 2014-15.

PICE007 - Picea orientalis 'Firelfy' - seedling of 'Skylands;', slower, more compact, smaller tree, same rich yellow softening to gold, finally a more green interior. Iseli Nursery c. 2014.

PICE008 - Picea pungens 'Avatar' - broadly upright, tiered branching. Leaves rich blue much as 'Moetheimii', from which it sprang as a seedling, slower growth than it also, and new needles in "soft blue powder puffs". Iseli Nursery, 2014-15.

PICE009 - Picea pungens 'Zafiro' - short, low pyramidal to wide beehive, 3-6 inches growth a year or less. Leaves rich light blue as 'Moerheimii' but onj a slower plant. Iseli Nursery, intro. 2014-15.

PICE010 - Picea pungens 'Lenawee Light'  -7 ft. tall x 3 ft. wide (10 years). Leaves rich golden. Found by Ken Marek, Adrian, Michigan on neighbor Larry's Hubbard's property, named for their County. conifertreasury.org, version 7.0, 2015, accessed 6.2.2015.

PICE011 - Picea pungens 'Lake Bluff' - compact. Leaves shorter, distinctly grayish-blue. Found in Michigan by Mike and Cheryl Davison. conifertreasury.org, version 7.0, 2015, accessed 6.2.2015.

PICE012 - Picea engelmannii 'Blue Magoo' - 6 ft. tall x 4 ft. wide (10 years), narrowly pyramidal, tips distinctly drooping at long, new growth. Leaves in rich grayish-blue to silvery-gray colors. Found the introduced by Buchholz Nursery, bef. 2014.

PICE013 - Picea abies 'Catharine's Golden Heart' - spreading-weeping to cascading, yellowish sheen over green, 3-5 inches a year, coning in youth. Or: Bob Fincham, named by Will Fletcher for his mother. Offered by www.coniferkingdom.com, accessed 2.16.2016
--end of OROC Data Sharing
Pieris

122 Cultivars


PIER001 - Pieris japonica 'Greprs' SOUTHERN LADY« - 4-5 ft. tall x wide. Flowers in pendulous panicles of white corollas, buds white not pink. Leaves rich, "shimmering " green, plants as a whole resistant to most damage including root rot and mites. Very adapted to  southern US heat and humidity, hence the name. High propagation rate as cuttings (85-90%). US Patent #23584 on May 5, 2013 to Harry Smujtzer and Mark Rainey, as open-pollinated 'Temple Bells' in 2008.
PIER002 - Pieris japonica IMPISH ELF™ 'Shy' - 3-4 ft tall x wide, compact. Stems dark red, showy. Leaves showy red in new growth. Flower corolla rich medium pink from dark purplish-pink buds, later in season.  Bred by Sven Svenson, Oregon State University. Monrovia.com, accessed 4.24.2015, new 2015 intro.
--end of OROC Data Shariung
Pinellia
There are two ways to access this paid content. If you are already a subscriber click the logo, load file, and enter your password. 

UPDATED 6.11.2016
$119 for all plant groups. Includes up to several years of updates (see offers). To subscribe or learn more please visit norlord.html



Pinellia tripartita 'Free Tibet' (variegate from 'Dragon Tails' x 'Atropurpurea') - available from plantdelights.com
Pinus

Jan de Langhe

RHS Encyclopedia of Conifers (book) - numerous cultivars and stunning photographs

Pinus albicaulis to Pinus densiflora - NEW UPLOAD 6.8.2014 -
Pinus strobus NEW UPLOAD 5.31.2014 -

The Conifer Treasury 5.0 by Mesterhazy (website, cultivar checklist) - very large, impressive checklist of cultivar with links to Google photos and thousands of original photos, much of the cultivar not in British and US conifer literature.


PINU001 - Pinus nigra 'Komet' (Iseli Nursery, commercial website, article)

PINU002 - Pinus parviflora 'Ooh La La' - compact, dense, globose. Leaves bright bloue as parent 'Glauca'. Mike and Cheryl Davison found as broom of 'Glauca' at an arboretum in Yakima, Washington, USA. Conifertreasury.org, version 7.0, accessed 5.29.2015.
Pistachia

'Bonsai' (P. chinensis x P. integerrima)

 5 cultivars


PIST001 - Pistachia chinensis WESTERN SON« 'Pairs Choice' - 30 ft tall x wide, upright-spreading to globose, stronger trunk, robust, good branch angles Leaves dark green, fall color reliably orange to red, however their images showsa golden base color with red to orange highlightss, not random as with most seedling populations. Fruit absent, male clone.
jfschmidt.com, accessed 4.24.2015
Pittosporum Pittosporum tenifolium Plant Assessment (PDF, RHS Trial Report)





Pittosporum illicoides FORMOSAN FINGERS 'MonToroko' (Monrovia) - another brilliant Dan Hinkley selection



'Hole in One' (Garden Gurus TV)
'Golfball' (Garden Gurus TV)
Plantago

UPDATED 6.11.2016
Platanus 32 cultivars
Also useful is a key separating out 7 species of Texas and Mexican, many of which are now in the trade and very hard to sort out. You also see plates of some rare species as well as rare cultivars like 'Howard', the chartreuse-gold American plane-tree.


If you thought you knew Platanus...consider the spectacular Platanus lindeniana with very sharp, almost star-shaped lamina in a rich olive green above and a simply glowing silvery-white backing to every leaf blade. The wind does it a great honor to help it show off. Sorry northerners, once again this is strictly USDA 7-8 and warmer material but imagine if these traits were bred to hardier species. This image is from a NOS postcard limited to 199 copies and that has no bearing on plant availability.


PLAT001 - Platanus x acerifolia 'Ace of Clubs' - "hybrid'. Leaves very strongly incised, often to 50% deep, gold in fall (New Zealand). Wairere.co.nz, accessed 4.24.2015

PLAT002 - Platanus occidentalis SILVERWOOD™ 'Grenickel' - 75-100 ft. tall, vigorous. Bark more white to cream shades, less tan and brown sections, like a palish Eucalpytus bark in fact. Greenleaf Nursery intro. c. 2014.

PLAT003 - Platanus x acerifolia ROCKFORD ROAD™ 'Grejtn' - 60-75 ft. tall\, vigorous proven clone. Bark more intensely white than typical, having some pale cream to tan patches too. Greenleaf Nursery intro. 2015.

--end of OROC Data Sharing
Platycladus Pinetum Novum by Hatch - 212 cultivars - info/order


RHS Encyclopedia of Conifers (book) - numerous cultivars and stunning photographs

Pinetum Novum by Hatch - PDF sample

The Conifer Treasury 5.0 by Mesterhazy (website, cultivar checklist) - very large, impressive checklist of cultivar
Platycodon


UPDATED 6.11.2016

A Comparative Study of Platycodon grandiflorus Cultivars by Richard G. Hawke (PDF article, cultivar trials, plant evaluation, Chicago Botanic Garden)

Pleiblastus 32 cultivars + additional botanical taxa
Plumeria


There are typically 1200-2500 Plumeria offers for new, rare, and specialty cultivars, many variegates, but more during warm weather shipping months.


Plumeria in Hawaii by Criley (PDF article, University of Hawaii) - a discusssion of important cultivars in this US state, including an identification key to these clones.

The Plumeria Society of America (plant society website) - many useful resources included Registered Cultivars

Virtual International Plumeria Society

Heliconia Paradise - a very nice cultivar listing

These nursery websites have numerous cultivars. Some of these sites have large, informative galleries:
- http://www.exoticplumeria.com/
- http://www.justplumerias.com/
- http://www.a-piece-of-paradise.org/
- http://www.junglejacksplumeria.com/
- http://www.paliplumies.com/
- http://plumeriaparadise.com/
Poa

Podocarpus

PODO001 - Podocarpus elongatus ICEE BLUE™ 'Monmal' is one of the frostiest of all conifers and certainly tops among the wide-needled ones. This icy tone is nothing new for a juniper or spruce but in this genus most taxa are dark green in our gardens. It is USDA 9 but people have done okay with it in 7b and 8 if in a much-sheltered courtyard against a very warm building. It should be smashing in any conservatory too. Click image to elongate. Photo above is not available for OROC Data Sharing.
PODO002 - Podocarpus nagi 'Thomasville Hardy' (Nurseries Caroliniana)
PODO003 - Podocarpus macrophyllus EMERALD FLAME™ 'Royal Flush' (Nurseries Caroliniana)
PODO004 - Podocarpus macrophyllus LEMON SPARKLER 'Golden Crown' (Nurseries Caroliniana)
PODO005 – Podocarpus macrophyllus var. Maki ‘Upright Columnar Cliff’ – columnar. Cold hardy in Chapel Hill, North Carolina (USDA 7b). Camforest.com, accessed 4.23.2015, their own selection from their original nursery grounds.
Podophyllum
UPDATED 6.11.2016
 
Polemonium
UPDATED 6.11.2016
Your computer, tablet, phone, or book reader can have the latest cultivar encyclopedia for each genus in handy PDF form - the most complete cultivar references for more than 103 ornamental, landscape genera. CULTIVAR.ORG is a product of more than 35 years of work by leading horticultural taxonomist Larry Hatch and the hundreds of experts in the New Ornamentals Society and our experts partners around the world. We exceed your familiar plant manuals, horticultural society "complete" guides, and most websites by 3-20 times more cultivars and with much more specific, detailed data. For example, 159 Aucuba cultivars, 191 Astilbe, 274 Aquilegia, 109 Ajuga, 1032 Acer, 59 Abelia, 175 Aglaonema, and 103 Aesculus. Click logo above for more details.

If you prefer to purchase volumes separately our Google Play Books Store has many of the same files for $7.20 to $20.00 each. CULTIVAR.ORG is however about 60% less expensive since you are mass-purchasing access at the Preferred Library Rate.
Polianthes
POLI001 - Polianthes x bundrantii 'Chirp'
POLI002 - Polianthes tuberosa 'Swarna Rekah'
POLI003 - Plianthes tuberosa 'PInk Sapphire' - 24-36 in. tall. Flowers double, light pink, some darker tints.
POLI004 - Polianthes tuberosa 'Yellow Baby' - 35cm tall. Flowers single, light yellow. http://www.ludwigandco.nl/, accessed 4.17.2015
POLI005 - Polianthes tuberosa 'Sensation' - 45cm tall. Flowers single, light pink. http://www.ludwigandco.nl/, accessed 4.17.2015
POLI006 - Polianthes tuberosa 'Cinderella' - 35cm tall. Flowers single, lavender-pink http://www.ludwigandco.nl/, accessed 4.17.2015
POLI007 - Polianthes tuberosa 'Double Pink' -  65cm, very tall. Flowers double, light pink. http://www.ludwigandco.nl/, accessed 4.17.2015
POLI008 - Polianthes tuberosa SUPER GOLD« - 65cm tall. Flowers single, dark rich yelow to gold. http://www.ludwigandco.nl/, accessed 4.17.2015
Poliomintha
Polygonatum
UPDATED 6.11.2016
Polygonum
UPDATED 6.11.2016

Polypodium
UPDATED 6.11.2016


POLY001 - Polypodium calirhiza 'Sarah Lyman' - fronds bipinnatifid, showier than species typical, more frilly, graceful, plumose, ornate, suggestive of Boston fern cultivars.The Flora of North America regards P. calirhiza as a true, non-hybrid species, an allotetriploid involving P. californicum and P. glycyrrhiza but not a direct hybrid of them alone. Those direct crosses are normally sterile triploids and very different from this new, clearly more complex, mysterious species. This clone found by Sarah Lyman in the wild about 1897 near Napa Valley, grown by her and distributed informally for many years, not named or widely sold until recent decades, absent from all but a few modern references and qualifying as an historical registration.
--end of OROC Data Sharing
Polystichum
UPDATED 6.11.2016
Poncirus


PONC001 - Poncirus trifoliata 'Snow Dragon' (variegated and twisted).
Click image to enlarge. You may use this image under OROC Image Sharing Terms
PONC002 - Poncirus trifoliata 'Tiny Dragon' (Hawksridge Farms)
PONC003 - Poncirus trifoliata 'Baby Dragon' (Nurseries Caroliniana) - same as 'Tiny Dragon'?
---end of OROC Data Sharing

Populus
North American Landscape Trees by Jacobson (book, Amazon) - there's much to learn from this horto-botanical treatment that is thoughtful, original, and
loaded with new research and insights.

Hatch's Cultivars of Woody Plants - 115 cultivars - (PDF ebook, New Ornamentals Society) - the best of the edible and ornamental choices.

FAO Registry of Cultivars of Populus by International Poplar Commissikon (cultivar database, ICRA) - search by epithet, species, parent, registrant, originator, nominant, etc.


Populus nigra 'Sandwitch' (Esveld Nursery)


Populus alba var. nicea 'Richardii', a golden-leaved sport of an already silvery, white tomentose species, giving some very curious pale yellow, gold, chartreuse, lime, and silvery-green tones from spring to late summer. It is surrely a weed species but not has ever been prettier. Kept small, pollarded, or as a bright hedge, the silver var. nivea and this sport of it make for a dramatic contrast with each other and other material. Ever dream of a gold, silver, and green hedge? This would one way to begin. Click image.

REGISTRATION STRICTLY LIMITED TO DISTINCTLY ORNAMENTAL, LANDSCAPE PROVEN TAXA
POPU001 - Populus nigra NORTHERN ESTEEM™ 'Schreiner' - vigorous, large tree in time, having the role of P. nigra or P. deltoides but with especially glossy, finely undulate, emerald green leaves, showing full disease and insect resistance, classic deltoid blades, proven very cold hardy in USDA 3. North Dakota State University purchased in 1978 from a Pennsylvania nursery as P. charkowiensis x P. 'Incrassata', evaluated over 30 years at the NDSU Arboretum and superior to most other large poplars studied. It was evaluated in 2011 by three US Forest Service experts and determined to be P. nigra as var. charkowiensis and var. incrassata are considered two of it's infraspecific variants by many poplar taxonomists (not all). It is considered now to be from the breeding work of E.J. Schreiner of the Northeastern Forest Station, Radnor, PA USA also known as NE308 and is now named for him. Officially introduced 2011. Further study of the name NE308 shows that the American EPA (Envrionmental Prtection Agency) listed it as a desirable "phytoremediation" clone in 1998. In other words, it can help purify a hostile, damaged environment and in the event of global environmental chaos thrive to produce wood for new buildings. Other work suggested that NE308 is photosynthetically more efficient and produces a larger biomess of roots, stems, and leaves than many popular, poplar clones.
Portulaca NODabp (New Ornamentals Database - Annual Bedding Plants) - (PDF ebook, New Ornamentals Society)


The Early History of Portulaca grandiflora Cultivars (1827-1915) by Hatch (journal article, Ornamentals Quarterly 1(1))


Portulaca HAPPY HOUR and HAPPY TRAILS are amongst the finest in the world today (PanAmSeed, commercial seed catalog)
Potentilla
- Herbaceous
RHS/AHS Encyclopedia of Perennials by Rice (book, Amazon)

UPDATED 6.11.2016
Potentilla
- Woody
Manual of Woody Landscape Plants by Dirr (book, Amazon) - very useful evaluations of cultivars, many quite new, from one of the top experts

Evaluation of Some Potentilla Cultivars by Telbisz (PDF article)

Models of Inhertiance of Flower Colour and Extra Petals in Potentilla fruticosa by Davidson and Lenz (PDF article, Euphytica) - available for purchase, first page is freeShrubby Potentilla Bulletin (PDF article, RHS Plant Trials)

Potentilla fruticosa Varieties in the Arnold Arboretum by Wyman (PDF article, Arnoldia, Harvard University) - a 1968 short review by Dr. Donald Wyman, providing measurements and appraisals with his typical wisdom.


POTE001 – Potentilla fruticosa CR╚ME BRULE™ ‘Bailbrule’ – 3.0-35. Ft. tall x 2-3 ft. wide, upright-rounded. Flowers double, bright white, Leaves medium to dark green. USDA 2. Bred at Morden Research Centre, Manitoba, Canada, introduced by Baileynurseries.com, website, accessed 4.23.201
POTE002 - Potentilla fruticosa 'Glamour Girl' (Plants for Europe)
POTE003 - Potentilla fruticosa HAPPY FACE« YELLOW  - 24-36 in. tall., compact, globose. Flowers numerous, corolla golden-yellow, blooms most of summer, strong for up to 4 weeks.
POTE004 - Potentilla fruticosa HAPPY FACE« PINK PARADISE 'Kupinpa' - 24-36 in. tall., compact, globose. Flowers numerous, corolla white heavily tinged pink, effectively light pink, patent app cliams "rich pink" (RHS 61C to N57D above), can be semi-double to double, average pertal count 10 (per patent app),  2.9cm wide, generally not shown as doubled on nursery websites (May 2015), may fade in extreme sun, blooms most of summer, strong for up to 4 weeks. US Plant Patent #22732 on May 15, 2012 to Henricus Kuijf as sport of 'Pink Beauty' 2006.
POTE004 - Potentilla fruticosa HAPPY FACE« WHITE 'White Lady' - 24-36 in. tall., compact, globose. Flowers numerous, corolla golden-yellow, 3.1cm wide, blooms most of summer, strong for up to 4 weeks. Leaves dark green, not pale as many white-flowered clones. US Plant Patent #22761 on May 29, 2012 to Pieter Kolster, self-pollinated 'Abbotswood' seedling 2004, assigned the Spring Meadow Nursery.
POTE005 - Potentilla fruticosa 'Red Lady' - compact, upright, sprfeading. Flower coroola 2.8cm wide (larger than 'Marion Red Robin'), color red, large. US Plant Patent #22767 to Pieter Kolster, from selfed 'Marion Red Robin' 2004, selected 2005, assigned to Spring Meadow Nursery.
-end of OROC Data Sharing



Primula
As Primrose or Primula:

As Auricula:


American Primrose Society (plant society website) - numerous resources since 1941

National Auricula and Primula Society (plant society website)



Double Auriculas by Derek and Pat Salt (special interest website)

Register of Swedish Raised Auricula Hybrids

The Primula Conference of 1886 (PDF ebook, Google Books) - one of the first known gatherings among experts, collectors, and breeders. A curiously valuable reference.

The Auricula by Biffin (ebook, Google Books)


4263 taxa, many cultivars

Prunus
incisa and
x incam
inclusive of 'Okame',
'First Lady',
and
'Dream
Catcher'


Prunus - all species and hybrid groups, now compiled into one 1132 page file, UPDATED 1.13.2016

Validation of Hybrid Flowering Cherry Prunuys x incam by Olsen and Whittemore (PDF article, US National Arboretum, USDA, Novon) - validation, typification, and clarification of Prunus incisa x P. campanulata hybrids from the time of Collingwood Ingram to the modern USDA/USNA crosses. This much-needed paper establishes the nomenclatural framework for literally millions of these hybrid trees in our temperate landscapes.


PRUN001 - Prunus incisa FRILLY FROCK (Esveld Nursery), a lovely gold-margined clone

PRUN002 - Prunus 'Helen Taft' is one of the newest US National Arboretum creations. Click the link below for the official release notice - and then the image to enlarge.
http://www.usna.usda.gov/Newintro/helen%20taft.pd

PRUN003 - Prunus 'Abigail Adams' release:
http://www.usna.usda.gov/Newintro/Abigail_Adams.pdf

PRUN004 - Prunus FIRST BLUSH™ 'JFS-KW14' - 25 ft. tall x 12 ft. wide, narrowly upright-ovoid. Leaves dark green, orange to orangish-red in fall. Flowers double to semi-doubble, open to cupped  face, not a rounded or dounle pom-pom double at all, showing stamens, buds darker pink with a calyx in violet-pink with darker violet-red margins, very fragrant. jfschmidt.com, their own selection, introduced 2016.

PRUN005 - Prunus PINK CASCADE™ 'NCPH1' - 12 ft. tall x wide, weeping, a narrow down-turning dome. Leaves dark green, finely textured, orange tones in fall. Flowers light to medium pink, very abundant, calyx a darker violet-red, corolla campanulate in general.
USDA 5. Selected at North Carolina State University. Introduced c. 2015.

PRUN006 - Prunus (Sato-Zakura Group) 'Little Jeremy' - 1.0-1.5m tall, usually grafted on high understock for a small globose tree, medium dense globose, not too congested, occasionally similar to well-known dwarf Prunus persica but with different leaf morphology. Flowers medium pink in bud, opening mear white to white tinged pink, single to semi-double, some petals notched.. Selected by Andre van Nijnatten, usually sold under P. serrulata but that pure species is very rare in the West, most material being Sato-Zaukra Group hybrids.

PRUN007 - Prunus incisa 'CarltonLT' LITTLE TWIST™ - 8 ft. tall x wide, compact, often grafted on a standard for better effect as a tree, distinctly twisted or contorted branching, flowers profuse, white centered in pink, fall color maroon. Typically grafted at 3-4 ft. on a standard. There is some concern that this is merely a rename of the Japanese clone 'Kojo-No-Mai', making 'CarltonLT' invalid and the trademark name not associated with the originator in any known way. Carlton's website:
http://www.carltonplants.com/uploads/pdfs/Carlton_Plants_Little_Twist_Brochure.pdf 


PRUN008 - Prunus incisa 'FPMSPL' LEMON SPLASH™ - 13 ft. tall x 6 ft. wide when grafted high on 4 foot standard, strongly pendulous, flower pale pink opening whiter. In summer leaves are yellow margined with green centers, giving an off-season interest so rare in weeping cherries.Or, pat: US# 23384 on Feb. 12, 2013 to Nick Dunn, Carlton Plants, found as sport of 'Snow Showers' in a nursery in Tenbury Wells, Worcesterhsire, England. . Google Patents shows the entire application:
https://www.google.com/patents/USPP23384?dq=prunus+incisa&hl=en&sa=X&ved=0ahUKEwjgrsDX5c_LAhVBLyYKHXs3CD8Q6AEIHTAA

PRUN009 - Prunus laurocerasus 'Zita' - 80cm tall x 200cm wide, slower to semi-dwarf, very compact, mounded, smaller than most popular cultivars. Leaves bronzish-red at first, later medium green and finally dark glossy green, reduced in size, mostly elliptic, never long lanceolate or oblanceolate as some cultivars. "Disease resistant" (species not specified). USDA 6. Or, pat: US# 26206  on  May 9, 2013 to Jozka Milkosne, Hungary, as whole plant mutation arising from seedling open pollinated from 'Mari', 'Piri', and 'Klari' but unclear as to the particular parent seedling's origin.

PRUN010 - Prunus persica 'Hinanotaki' - habit medium vigor, weeping, ornamental overall. Flowers numerous, double, pink, containing fertile pollen. Fruits in 105 days, round-elliptical to round, small, 173g (mean weight), skin yellow with red blushes, flesh yellow with some red blushing, semi-non-melting, clingstone. Or: National Ag. and Food Res. Inst. of Fruit Tree Science (NIFTS), Japan, intro. 2008. Web:
http://www.cabdirect.org/abstracts/20153403143.html;jsessionid=9D7D38D7085169998F263A987014BD75

--end of OROC Data Sharing

Prunus
laurocerasus
Esveld Nursery - Prunus image gallery - lot of the best new and old clones, many not yet in North America


Prunus laurocerasus 'Batumi Rubies' is a large-bladed, very dark clone with a nicely rolled to subconvex leaf. The leaves are flatter in warm weather and as the plant matures. The real delight is the present of often abundant, showy dark red fruit that gradually mature from gold and orange tones. It is as durable as the species and then some. It's ultimate height is that of a tree or massive shrub, becoming 8-12 feet tall in 10 years or so. Click image.

Prunus laurocerasus 'Gajo', 'Piranha', and 'Ivory' (newplants.nl)
Prunus
padus,
pendula,
and
persica

North American Landscape Trees by Jacobson (book, Amazon) - a very outstanding study of ornamental cultivars up to the 1990's, including British and American clones. Very solid for study of this group.

Studies on Ornamental Peach Cultivars by Yoshida et al. (PDF article)

Breeding Trends for Ornamental Peach by Hu and Zhang (PDF article, Acta Horticulturae)

The Breeding of Ornamental Edible Peaches for Mild Climates by Lammerts (PDF article, American Jounrla of Botany)

Genetic Relationship of Ornamental Peach Determined by AFLP Markers by Hu, Zhang, et al. (PDF article, HortScience) - a mind-blowing article covering a rich number of Chinese cultivars of P. persica and some apparent crosses to P. davidiana.  51 taxa, most cultivars were covered. Happily this study includes some recent US crosses, the columnar Corinthian Series by Denny Werner of NC State.

Evaluation of Ornamental Peach Genotypes for Landscaping Use by Silveria (PDF artcle)


Prunus persica 'NCSU Dwarf Double Red' at the JC Raulston Arboretum, one of the finest genetic dwarf (3-5 feet in 10 years) cultivars for double, radiant pink flowers. It was bred at North Carolina State University about 30 years back. It functions very much as a floriferous shrub, fruit limited and not edible, and unfortunately very highly beset with black mildew on the stems in the warm, humid climate of Raleigh, North Carolina but pretty for a week or two each spring. This image appeared as the NOS Card, a special line of postcards offered by the New Ornamentals Society around 2007. Click image to enlarge.
If you prefer to purchase volumes separately our Google Play Books Store has many of the same files for $7.20 to $20.00 each. CULTIVAR.ORG is however about 60% less expensive since you are mass-purchasing access at the Preferred Library Rate.
Prunus -
Sato Zakura Group
formerly
Prunus
serrulata

(large flowering tree
cherries)


Japanese Flowering Cherries by Kuiter and Peterse (book, Amazon) - easily the modern standard with lots of clarity in nomenclature and history. Highest recommendation.
 

North American Landscape Trees by Jacobson (book, Amazon)- a treasure for this genus with lots of original content and solid nomenclature. Much more complete and deep than Hillier, Bean, Dirr, and many other better known authors.

Ornamental Cherries by Ingram (book, Amazon) - this book started it all and every important library should have a copy of this. It's now a semi-rare book and copies range from expensive to oddly cheap.

Evaluation of Flower Cherry Species, Hybrids, and Cultivars Using Simple Sequence Repeating Markers by Ma, Olsen, and Pooler (PDF article, US National Arboretum, US Department of Agriculture,Journal fo the American Society for Horticultural Science) - interesting study from principles in the USDA-USNA cherry breeding program. 119 taxa covered.

Clone Identification in Japanese Flowering Cherry Cultivars Using Nuclear SSR Markers by Kato et al. (HTML article, Breeding Science) - 215 cultivars


USDA - ARS - US National Arboretum - Drs. Pooler and Olsen - Evaluation and Genetic Improvement of Woody Ornamental Landscape Plants for Disease and Pest Tolerance, Non-invasiveness, and Ornamental Traits
Prunus
sargentii,
P. x subhirtella,
P. x yedoensis,
to P. virginiana
Pseudotsuga



THIS IS AN EXPERIMENTAL TABLE CELL DESIGN AND DIFFERS BY DESIGN FROM ALL OTHER CONTENT ON THIS PAGE AND SITE.

PSEU001 - Pseudotsuga menziesii 'Alber's Elegant Weeping' Conifer Kingdom, online website, accessed 11.23.2013.
ha: narrowly pendulous, graceful
lc: typical green
or, ns: Sam Pratt, Gig Harbor, WA USA, named for his mentor Dr. John Albers

PSEU002 - Pseudotsuga menziesii 'Blacksmith Fork' Porterhowse Farms, Current Specimen
List (ACS Database subset), accessed
11.23.2013
ha: dwarf, original broom vase-shaped
or: Carl Wildrick found broom in Utah USA

PSEU003 - Pseudotsuga menziesii 'Boyko's Blue Weeping' Conifer Kingdom, online website, accessed 11.23.2013
ha: narrowly pendulous, graceful
lc: bright blue
or: Jim Boyko

PSEU004 - Pseudotsuga menziesii 'Card Canyon' Porterhowse Farms, Current Specimen
List (ACS Database subset), accessed 11.23.2013
ha: dwarf from 18 in. wide, subglobose broom
or: Carl Wildrick found in Utah, USA

PSEU005 - Pseudotsuga menziesii 'Crescent Mountain' Garden Web, Conifer Forum, accessed 11.23.2013 with color photo
ha: dwarf
lc: rich frosty blue

PSEU006 - Pseudotsuga menziesii 'DuPont Dynamite' Conifer Kingdom, online website, accessed 11.23.2013
ha: "super-dense upright globose" from broom
ll: shorter
lc: slightly glaucous-blue, buds showy orangish-brown
or: Dave Olszyk

PSEU007 - seudotsuga menziesii 'Metolius Weeper' Porterhowse Farms, Current Specimen
List (ACS Database subset), accessed PSEU11.23.2013
ha: large, strong, narrow, branches strictly pendulous
or: Porterhowse says Art Anderson with Tim Moriarity found this along the Metolius River in Oregon. He also received
scionwood
or: Frank Hoffman that same year, who apparently discovered it too! The original wild tree died in a forest fire

PSEU008 - Pseudotsuga menziesii 'Helena' Mesterhazy in Conifer Treasury of the Cz. Republic 2.0, 2012
ha: dwarf from a broom, 3cm growth per year
or: Ladislav Musil, Musil Gardens, Cz. c. 2001

PSEU009 - Pseudotsuga menziesii 'Mount Angel Blue' Conifer Kingdom, online website, accessed 11.23.2013
ha: compact from broom
lc: bluish-green
frq: female strobili often numerous
or: Stephanie Krieg found as broom at Evergreen Golf Course, Mt. Angel OR

PSEU010 - Pseudotsuga menziesii 'Shorty's Blue' Buchholz and Buchholz Nursery, online catalog, accessed 11.23.2013
ht: 7 ft. tall x 3.5 ft. wide (10 years)
ha: upright, compact, pyramidal
lc: rich blue
---end of OROC Data Sharing
Pteris
Exotica 4 by Graf (book, Amazon)

Plant Delights Nursery (nursery website) - a source for new named clones of the genus, most recently P. actiniopteris 'Silver Illusion', P. vittata 'Benzilan', P. wallichiana 'Hualien Giant', and P. cretica 'Korean Petticoat'. In the past and perhaps in the future they list P. cretica 'Ping Wu' and P. cretica var. nerosa 'Western Hills'.


UPDATED 6.11.2016


Pterocarya

Flora of China


PTER001 - Pterocarya fraxinifolia 'Abbotsbury Giant' - vigorous, larger than species typical. Leaves to 60cm long. Female inflor. to 50cm long, lafrger than many specimens. From a notably vigorous, larger in nearly all parts at Abbotsbury Garden, Dorset, England, considered superior to random nursery seedlings.
--end of OROC Data Sharing
Pueraria
montana
var.
lobata






click image to enlarge
Pulmonaria
PULM001 - Pulmonaria 'Darkling Thrush' - as P. longifolia but leaves brown-tinged in late winter and early spring, contrasting well with white spots, flowers corolla dull violet. Desireableplants.com, accessed 5.21.2015, their own random seedling, likely a product of nearby P. longifolia 'Ankum' and perhaps P. saccharata 'Leopard'.
--end of OROC Data Sharing


UPDATED 6.11.2016

Punica


Restriction: cultivar registration is limited to cultivars with highly ornamental and unique traits of interest in landscape design
PUNI001 - Punica granatum 'Carrot Top' (Plant Delights)


PUNI002 - Punica granatum 'Eight Ball' is a rather compact clone with small glossy, burgundy red fruit that is more ornamental than edible. The exocarp darkens to a lustrous reddish-black, inspiring Tony Avent to give it one of his usually creative and fun names. Please click on the image to enlarge. This image may NOT be extracted and copied under OROC Data Sharing.
PUNI003 - Punica granatum PURPLE SUNSET« 'PIIPG1' - Habit compact, dense, as parent 'Nana', 3-4 ft. tall x wide, up to 6  ft. tall in warm climates such as Florida.  Fruit dark blackish-purple, 2-3 in. wide, generalky not considered edible. US Plant Patent #21031to Dr. Mike Dirr, open pollinated 'Nana' before 2008. 
Pycnanthemum
Plant Delights Nursery (nursery website) - they offer or recently offered P. incanum 'Stowe Away', P. loomisii Campbell Co TN clone, and P. tenuifolium 'Cat Springs'.

Pyracantha
Breeding Pyracantha for Fire Blight Resistance by Bouma (PDF article, Acta Horticulturae)

Pyracantha Breeding Program in France: First Results by Cadic (PDF article, Acta Horticulturae)

Identification of Pyracantha Varieties by Helene (PDF article, Acta Horticulturae) - observations on 34 cultivars or clones


A Checklist of Pyracantha Cultivars by Egolf and Andrick (PDF document, United State Department of Agriculture, United National Arboreutum, Archive.org) - a little known and seen checklist from 1995 and very highly recommended.


PYRA001 - Pyracantha 'Golden Paradise' - 1.5-1.8m tall x 1.0m wide (10 years). Leaves bright yellow at first, laster more chartreuse. Fruit orange. Coblands.co.uk, accessed 4.25.2015, their own selection, introduced 2014. The first ever all gold-leaved cultivar on the market.
Pyrossia New file 10.24.2014 - 23 cultivars

NEW FILE10.24.2014
Pyrus
including
x Pyrocomeles
and
x Pyrodonia

Hatch's Cultivars of Woody Plants - 32 ornamental cultivars (New Ornamentals Society)



PYRU001 - Pyrus JAVELIN™ (J.F. Schmidt)


Pyrus JAVELIN™ (click link above for details). Photo courtesy of originator Dr. Tom Ranney. Click to enlarge. Photo may NOT be extracted under the OROC Data Sharing program due to copyright status.

PYRU002 - Pyrus calleryana 'Kea' - leaves glossy green, mix of very dark red and gfreen in fall. Adapted to New Zealand climate. Wairere.co.nz, accessed 4.25.2015
Quercus

Jan de Langhe

Manual of Woody Landscape Plants by Dirr (book, Amazon) - very useful evaluations of cultivars, many quite new, from one of the top experts

Oak Names Database by Trehane (International Oak Society)


  'Cathedral' live oak by Nature Coast Tree (click logo below)

QUER001 - Quercus x bushii 'Seattle Trident' (Bluebell Nursery)
QUER002 - Quercus serrata 'Curly Head' (Bluebell Nursery)
QUER003 - Quercus palustris 'Flaming Suzy' (Bluebell Nursery)
QUER004 - Quercus robus 'Timuki' (Bluebell Nursery) - best purple oak yet and mildew resistant?
QUER005 - Quercus palustris PACIFIC BRILLIANCE™ (Upshoot)
QUER006 - Quercus STREETSPIRE« 
QUER007 - FOREST KNIGHT« (J.F. Schmidt) - useful file explains the various Q. robur, bicolor, and alba hybrids with picture of each and how they differ.
QUER008 - Quercus alba 'Wieting' - fall color rich medium to dark red, glowing in some light conditions, very showy. Origin: Mr. Wieting,  Germany.
QUER009 - Quercus robur 'Alrnap Weeping' - low, true weeping mound, apparently more constrained and less wild than the old, original 'Pendula'. Photo: http://gardenbreizh.org/photos/Oli/photo-589489.html
QUER010 - Quercus bicolor BUCK'S UNLIMITED™ - vigorous. Flowers, nuts born earlier, often on trees as yooung as 5 years (vs. 20+ years for species). Fruit (nuts, mast) abundant. Up to 96% seedling survival which together with vigor make this a useful ornamental, landscape taxon. fknursery.com, accessed 5.2.2015., their intro. in cooperation with the Dr. Mark Coggleshall, University of Missouri.
Quercus nuttallii RUBY SPRING™ 'Betterred' - new growth bright red to purplish-red in spring, substantially showier than most oaks in spring leaf, maturing to typical dark green, fall colors in yellow to bronze shades, proven to fall cleanly. Pat: US# 24813 In: www.boldspring.com, accessed 2.28/2016. Web:
http://athenatrees.com/our-introductions/ruby-spring-nuttall-oak/

Quercus nuttallii 'Big Boy' - clonally vigorous, new growth of foliage green (not red), fall color intense red to bronze-red, rivaling any oak for red autumn tones. Or: Glenn Simmons, Natchez, Mississipii.  In: www.boldspring.com, accessed 2.28/2016

---end of OROC Data Sharing


NAPCC Multisite Quercus Collection - the consortium of North American oak collections which includes most cultivars. This group includes such noble institutions as Morton, Morris, NYBG, Cornell, Scott/Swarthmore, Denver BG, Chicago BG,and University of Washingtion.

The Oaks of Chevithorne Barton




Hatch's Cultivars of Woody Plants - 278 cultivars (New Ornamentals Society)



Starhill Forest Arboretum (HTML document, arboretum website) - originator of some recent, unique cultivars

McArdle and Santamour Checklists (Journal of Arboriculture):
---- Quercus robur
---- white oaks


Copyright 2013, 2014, 2015 Laurence C. Hatch. All Rights Reserved.
Rabdosia - 3 cultivars

Ranunculus -
Tender
Bulbous

Ranunculus -
Hardy
Herbaceous

UPDATED 6.11.2016 - 65 cultivars


RANU001 - Ranunculus fiscaria 'Orange You Cute' (Plant Delights, their own introduction)
Rhamnus

RHAM001 - Rhamnus frangula 'Minaret' - Narrowly erect., desner than old 'Fastigiata'. Leaves dark green, oval, much texture.
Rhaphiolepis

RHAP001 - Rhapiolepis umbrellata SOUTHERN MOON™ (Monrovia)
RHAP002 - Rhapiolepis indica COSMIC WHITE™ (Ozbreed). Please click vid below.
Rheineckia
Rheum
UPDATED 6.11.2016
Rhexia
UPDATED 6.11.2016
Rhododendron -
Azalea



Deciduous azalea cultivars

Azalea Society Gallery (plant society website, gallery)

US National Arboretum - Glenn Dale galery (arboretum website, gallery)

American Rhododendron Society - Azalea Search (plant society website, cultivar database)



'Squirrel' (RareFind Nursery)
Rhus


RHUS001 - Rhus typhina 'Radiance' (Bluebell Nursery, available 2015)

RHUS002 - Rhus glabra SUNFIRE™ - new growth bright chartreuse to lime, mixing with orangish-red to rich red colors in fall, coloring up in fall earlier than TIGER EYES«. 
Ribes
RIBE001 – Ribes sanguineum AMORE ‘Anny-2003’ – Plants 1.5 tall x 1.0 m wide. Flowers abundant, rich pinkish-red, sweet vanilla fragrance. Bred by Andre van Nijnatten, Netherlands.

RIBE002 - Ribes sanguineum 'Oregon Snowflake' - 1.2m tall x 1.3 m wide, mounded, semi-dwarf, much more compact and dense than WHITE ICICLE™. Leaves deeply lobed, strongly 5-palmatifid, 5-lobed, lobes acute (not obtuse to subobtuse as WHITE ICICLE™), margins also incised to very long-serrate, distinct shape and margins from most popular cultivars, 5.0cm long x 5.3cm wide, longer than WHITE ICICLE™. Flowers in pendulous racemes to 10cm long, 39 flowers (mean), corolla 2cm wide, greenish-white, appearing mostly white from a distance. Dr. Ryan Contreras and Mara Friddle, Oregon State University, Corvallis, Oregon USA from EMS treated seeds, selected 2001.
See HortScience Cultivar Release for additional measurements and details.
--end of OROC Data Sharing
Ricinus
Robinia


Hatch's Cultivars of Woody Plants

USDA Soil Conservation Service (government website) - three named cultivars of the Steiner Group, 'Appalachia', 'Algonquin', ad 'Allegheny', which are ornamental, durable, and proven. They are selected mostly for habit, borer resistance, and vigor.


Variations of Robinia by Larry Hatch (plant society video, plant society website, New Ornamentals Society)
Rodgersia

Original cultivar.org key by Larry Hatch

UPDATED 6.11.2016


RODG001 - Rodgersia 'Kupfermond' - leaves tinged copper to bronze. Flower heads large, light pink, fluffy appearance, held above foliage, sturdy, strong. German origin bef. 2013.

RODG002 - Rodgersia pinnata 'Jade Dragon Mountain' - stems red, showy. Flower heads dense, pink to reddish in bud, maturing to cream.  Selected by Spinners from Roy Lancaster Collection  L1670.

RODG003 - Rodgersia 'Stoke Gabriel' - leaves pseudopinnate, much as Rodgersia pinnata, dark green, showy red petioles, Flowers white in elongated, arching inflorescences, showy red pedicels. A tricolored mix of green, white, and red shades at once. Selected by Heather Booker, National Rodgersia Collection UK, North Devon, England. Desireableplants.com, accessed 5.21.2015, with "NEW CULTIVAR NAME"
--end of OROC Data Sharing
Rohdea
UPDATED 6.11.2016 - 34 cultivars

Romneya
Rosa


American Rose Society - Official Registry and Checklist - Rosa (plant society, ICRA, cultivar register) - 33000 cultivars - the full, official document, so overwhelming only a rose fan could comprehend it all.

American Rose Society - Recent Registrations page (plant society website, ICRA) - useful to learn about the latest cultivars. One has to join the ARS to get access to the full online, Modern Roses database.

World Federation of Rose Societies - Cultivar Search for conservation of old cultivars (plant society website, database) - a searchable reference of immense value to researchers

Everyrose.com database (cultivar database, special interest website) - 7500 cultivars - not literally ever rose but enough to help and inform most of us.

Help Me Find Rose Database (cultivar database) - 44000 cultivars - perhaps larger than the ARS Official Register and with lots of detail on each clone. 160,000 photos.

Thousands of patented clones


Select Roses - New Varieties (Brad Jalbert, new cultivars)
Roscoea
UPDATED 6.11.2016
Rosmarinus
Hatch's Cultivars of Woody Plants - 260 names, app. 220 cultivars (PDF ebook, New Ornamentals Society) - this new checklist from July 2013 is still open for review by society members, our expert panel, and our loyal subscribers. The final cultivar count is not determined but we expect it to be between 210-240.

UPDATED 6.11.2016



'Athens Blue Spire'

North Carolina Rosemary collections

Hatch's Cultivars of Woody Plants with 220 cultivars is our nomenclatural standard.
ROSM001 - Rosmarinus officinalis CHEF'S CHOICE« 'Roman Beauty' - 12-18 in. tall x 2 in. wide, compact, suitable for smaller kitchen gardens. Leaves with higher oily content, more spicy, rich in cooking and when pressed, medium green, not very silver nor gray.  Flower corolla light sky blue. US Patent #18192 inm 2007 to Christopher Fairweather, UK as open-pollinated Prostratus Group. Cold hardy to -10 deg. F. We believe it deserves registration by OROC as the marketing trademark is quite recent for the US (May 2015). It is ma\rketed by planthaven.com, accessed 5.12.2015, but they only use the 'Roman Beauty' name. The trademark name appears to have originated with:
http://sunsetwesterngardencollection.com/plant-collection/plant/chefs-choice-rosemary
accessed 5.12.2015
Rubus
http://www.rubusspecies.com/ (Barry Clarke, Hillier Gardens) - an outstanding study of ornamental and native UK species as well as rare and superior cultivars. As with all great specialty sites from passionate scholars, this one makes you doubt your knowledge of the genus and want, nay, desperately lust for some of the odd species and finer cultivars you did not know existed. There are bright silver leaves, silvery markings, golds, variegates, ferny stuff, textured magic, and even one species than looks like a x Heucherella. If all this material was crossed and selected, maybe made thornless once in awhile, Rubus just might be the next Japanese maple or Heuchera but is super durable shrub form.


RUBU001 - Rubus 'Margaret Gordon' (The Garden Flora of Northern Ireland)

RUBU002 - Rubus cockburniana 'Razzle Dazzle' - new growth mottled pink and cream, maturing variegation light green, medium green, various shades of yellow to cream, finely mottled, sometimes more boldly sectored. Introduced by Broken Arrow Nursery.  Farreacesafarm.com, accessed 4.13.2015

 
Rudbeckia

Rudbeckia maxima 'Golda Emanis' (Plant Delights, Greg Grant) - chartreuse-green new growth if in good light


Ruellia
Ruellia simplex 'Mayan Pink'
Ruscus d

RUSC001 - Ruscus aculeatus 'Elizabeth Lawrence' (Plant Delights)

RUSC002 - Ruscus hypoglossum 'Mr. Lonely' (Plant Delights)
Rudbeckia

RUDB001 - Rudbeckia maxima 'Golda Emanis' (Plant Delights, Greg Grant) - chartreuse-green new growth if in good light
Ruellia
RUEL001 - Ruellia 'Black Beauty' (Plant Delights)
Sabal
Sabatia
Saccharum

SACC001- Saccharum arundinaceum 'Purple People Greeter' (Plant Delights)
Saintpaulia AVSA Publications Page (books, CD, DVD, journal) - this includes their Master List of 13,000+ cultivars:
http://www.avsa.org/shop/books-publications/avsa-master-variety-list-12-2010-spiral-bound-1
and the First Class 2 Database software that adds 2000 photos to the Master List:
http://www.avsa.org/shop/books-publications/software-programs/first-class-2



Where to Buy Mailorder African Violets by Hatch (Youtube video, nursery sources) - Saintpaulia catalogs are still the best cultivar references because new material comes out every year. This video shows all the best reference catalogs.

African Violet Society of American (website, plant society) - one of the most sophisticated plant societies ever with unlimited resources of all kinds.

Dixie African Violet Society Master Registered Variety List (PDF, plant society website) - this southern society list covers cultivars not registered but many of importance and merit in the modern trade. I've turned to this reference over and over when buying violets.


Pauli by Hatch (XLS spreasheet, database, New Ornamentals Society) - free database to select from among 2000+ cultivars including new stuff.

Salix
Willows: The Genus Salix by Newsholme (book, Amazon) - a very substantial work, equally for botanical and cultivar information. Highly recommended.

North American Landscape Trees by Jacobson (book, Amazon) - there's a rich depth of data, original research, and solid taxonomy tha
t exceeds some contemporary works like the much better known Hillier and Dirr manuals. NALT covers trees  only and not the wilows shrubs but I still find it a valuable, more detailed treatise than both Dirr and Hillier.

Hatch's Cultivars of Woody Plants - 160 cultivars (New Ornamentals Society)




The Registration of Salix Cultivars by Kuzovkina (FAO) - a proposal

USDA Conservation Cultivars (government website, cultivar release) - durable, ornamental, proven, and documented clones or strains.


SALI001 - Salix crenata 'Gang Bo Ha' (Buchholz Nursery)
SALI002 - Salix alba f. sericea 'Silver Column' (Song Sparrow Nursery) - a narrower version of the popular "silver willow" (this botanical, furry form) found at the Arnold Arb., about 35 ft. tall x 17 ft. wide. Either this or the basic form are amazing contrast trees for adding shimmering sterling tones that surpass most Elaeagnus.
SALI003 - Salix alba 'Swizzlestick' - Habit erect, contorted. Twigs yellow to orange shades in sun. Orgin: Darrel Probst. Farreachesfarm.com, accessed 4.15.2015.
SALI004 - Salix chaenomeloides BLACK CAT™ 'Lubber's Zwart'.- see photo below
---end of OROC Data Sharing

Cultivars of Salix babylonica and Other Weeping Willows by Santamour and McArdle (cultivar register, US National Arboretum, USDA, Journal of Arboriculture) - a typical, thorough take on a difficult group by one of America's top woody plant experts of the 20th century.


Salix chaenomeloides BLACK CAT™ 'Lubber's Zwart'. Please click image to enlarge.
Salvia -
Perennial
A Book of Salvias by Clebsh (book, Amazon) - the long-time standard for cultivar and species info relative to ornamental use. The newest edition or New Book of Salvias has replaced it.



Salvias by Yeo (book, Amazon)

Hatch's Perennials 1.0-3.0 - 365 cultivars (New Ornamentals Society)

UPDATED 6.24.2016

RHS/AHS Encyclopedia of Perennials by Rice (book, Amazon)

Ornamental Sages for the Garden by Avent (article, Plant Delights Nursery) - nice summary of the best cultivars and you can buy them from this site too

Cabrillo College Salvia Collection (university website) - collection list and descriptions of their own hybrids as well as sales, photos, etc

A World of Salvias by Dufresne (website) - many useful resources (including plant sales) from one of the top experts on this genus. The nursery is a good source of new and rare Plectranthus.

Ashwood Nurseries (nursery catalog website) - this firm grows and described about 80 taxa.





SALV001 Salvia scabra 'Good Hope' (Jelitto Seeds)
SALV002 Salvia CATHEDRAL™ Series (GreenFuse Botanicals)
SALV003 SALSalvia leucantha 'Ferpink' (Plant Delights)
SALV005 – Salvia ‘Amistad’ – 3-4 ft. Tall x 3 ft. Wide, more compact than most S. guaranitica hybrids.  Flower calyx very dark blackish-purple, corolla dark violet-purple. Introduced by Souther Living Plant Collection 2015.
SALV006 - Salvia BLUE NOTE« - 20cm tall x 60cm wide. Flower corolla intense medium blue, calyx very dark. fleursetsenteurs.com, accessed 5.26.2015, their own introduction.
SALV007 - Salvia MELEN« - 20cm tall x 60cm wide. Flower corolla cream to light yellow tinged red in upper labia, calyx very dark, blackish.  fleursetsenteurs.com, accessed 5.26.2015, their own introduction. Bronze Medal, Plantarium 2010.
SALV008 - Salvia 'Violin Music' - 20cm tall x 60cm wide. Flower corolla rich lavender-violet. Leaves oval, dark green, 2.5cm long.. fleursetsenteurs.com, accessed 5.26.2015, their own introduction.
SALV009 - Salvia 'Red Swing' - 80cm tall.. Flower corolla rich cardinal or cherry red, calyx purplish-black, contrasting much.. fleursetsenteurs.com, accessed 5.26.2015, their own introduction.
Pending - Salvia Wish Collection (Plants Management Australia) - see wideo below
--end of OROC Data Sharing


Sambucus


SAMB001 Sambucus nigra BLACK TOWER™ (Wayside Gardens)
SAMB002 Sambucus nigra RED HOLY 'Thundercloud' (Esveld)

SAMB003 - Sambucus nigra INSTANT KARMA™ 'Sanivalk' - 6-8 ft tall. leaves bluish-green, irregularly margined golden-yellow becoming margined creamy-white by summer, flowers numerous. Or: Peter Brand, A. Brand and Sons, Hertfordshire, UK, Canadian  PBR applied for 2016.

SAMB004 - Sambucus nigra 'Sunrise Surprise' - leaves yellow, very lacy, highly incised, fall red fruit contrasting with it. Or: Liss Forest Nursery, intro. 2016. http://conceptplants.com/plant/?p=sansunr, accessed 1.16.2016

 
Sanguinaria
UPDATED 6.24.20165 cultivars
Sanguisorba
UPDATED 6.24.201619 cultivars
Sansevieria
179 cultivars


Most recommended at above are:
* Stover, H. 1983. The Sansevieria Book.
* Chahinian, B.J. 1986. The Sansevieria trifasciate Varieties.
*
Chahinian, B.J. 2005. The Splendid Sansevieria.

International Sansevieria Society (plant society website)

Mike Phillips Flickr website (specialy interest website, gallery) - lots of informative images

eBay - various stores (auction website, nursery catalogs online) - collectors will know that some of the newest, rarest clones including unnamed sports come from this site. There are always new discoveries and rare cultivars, often 200-400 offers in the genus, at any given time.



SANS001 - Sansevieria trifasciata 'Tyler' - 40-45cm tall, much as 'Robusta' (intermediate between Trifasicate Group and Hahnii Group) but more vigorous , 6-7 leaves per rosette (more than similar 'Robusta'), pale yellowish-green crossbands (more pale green in 'Robusta'), thinly margined yellow. Selected by Marvin Villegas, US Patent #25036 in 2014 as improved sport of 'Robusta'
--end of OROC Data Sharing
Santolina
UPDATED 6.24.201618 cultivars


Saponaria
UPDATED 6.24.201611 cultivars
Sarcococca

Jan de Lange

Sarracenia

Flora of North America

UPDATED 6.24.2016- 63 cultivars and some very big, high-resolution digital images of the best stuff, including a few very pretty species forms and color variations.



The Pitcher Plant Project - wonderful insights into breeding new cultivars, culture, and more. Dark purple, wavy lids to 6 inches wide, glowing pink rims, new sunset combinations, and clean, unveined white lids.

SARR001- Sarracenia 'Carolina Yellow Jacket' (Plant Delights, David Crump)
SARR002 - Sarracenia purpurea 'Jersey Girl' (Plant Delights)
Sauromatum
If you prefer to purchase volumes separately our Google Play Books Store has many of the same files for $7.20 to $20.00 each. CULTIVAR.ORG is however about 60% less expensive since you are mass-purchasing access at the Preferred Library Rate.
Satureja
UPDATED 6.24.20162 cultivars
Saururus
SAUR001 - Saururus crenuus 'Hertford Streaker' (Plant Delights) - slower, compact, not weedy or aggressive as species due to lower vigor of this variegated sport. Leaves heavily  margined cream to white, chimera up to 80% surface, the central zone an irregular mix of light grey, silvery-green, and green patches forming the shape of an irregular toothed leaf shape (15-20% surface). Jesse Perry found as sport in Hertford, North Carolina USA, introduced by Plant  Delights Nursery, Raleigh, North Carolina 2014.
Saxifraga
UPDATED 6.24.2016


Saxifraga: The Definitive Guide by Malcolm McGregor (book, Amazon) - unbelievably intense, comprehensive monograph, once pricey except for big fans but used copies are commonly $10-12 a copy.

Saxifraga World - highly recommended

SaxBase by The Saxifrage Society - another splendid reference of the highest merit.
Scabiosa
UPDATED 6.24.2016
Sciadopitys Pinetum Novum by Hatch - 93 cultivars (New Ornamentals Society)


RHS Encyclopedia of Conifers (book) - numerous cultivars and stunning photographs

The Conifer Treasury 5.0 by Mesterhazy (website, cultivar checklist) - very large, impressive checklist of cultivar 
Schizachryium

SCHI001- Schizachryium scoparium 'Standing Ovation' (Wayside Gardens) - 3-4 ft. tall x 12-18 in. wide, very erect, compact. Leaves rich light blue, tinged dark purple near the base, very bright orange, yellowk, red, and purplish-brown fall coloration, blades thicker than species typical.  US Plant Patent 25202 to North Creek Nursery.
 

SCHI002 - Schizachyrium scoparium 'Seasons in The Sun'  - 90-110cm tall. Leaves bluish-green, becoming dark purple  or purple tinged in late summer and fall
.

SCHI003 - Schizachyrium scoparium 'Cinnamon Girl' - 65-80cm tall. Leaves dark red to cinnamon-red in fall, a bit of a dusky rose over green with some red before that.

SCHI004 - Schizachyrium scoparium 'Good Vibrations' - 100-120cm tall. Leaves steell bloue to grayhish-blue, no red or other fall colors but keeping this valuable blue sheen to contrast with the rest. Flower racemes much larger than typical, showy, tinged red.

SCHI005 - Schizachyrium scoparium 'Smoke Signal'
SCHI006 - Schizachyrium scoparium 'Twilight Zone'
SCHI007 - Schizachyrium scoparium 'Prairie Munchkin'
--end of OROC Data Sharing

UPDATED 6.24.2016
Schizostylis 37 cultivars
Schlumbergera
Schlumbergera 'Thor Britt' (Logees)

Greenex.com (nursery website) - the whole THOR cultivar story and descriptions


Scirpus
UPDATED 6.24.2016
4 cultivars

Scrophularia
UPDATED 6.24.2016
3 cultivars
Scutelaria
UPDATED 6.24.201618 cultivars
Sedum -
Hardy
Sedum: The Cultivated Stonecrops by Stephenson (book, Amazon)

Plant Jewels of the High Country by Payne (book, Amazon)

Handbook of Cultivated Sedums by Evans (book, Amazon)

Hatch's Perennials 1.0-3.0 - 266 cultivars (New Ornamentals Society)

UPDATED 6.24.2016


Herbaceous Sedums Bulletin (PDF, RHS Trial Report)

Sedumphotos.net (website, gallery) - a very useful reference of 600 different succulents (most Sedum) with 1700 original images. Very nice project. Wayne Fagerlund is a stonecrop grower and expert and is trying to bring clarity to names and taxonomy.


SEDU001 - Sedum 'Touchdown Teak'
SEDU002 - Sedum 'Lemonjade' (Walters Gardens)
SEDU003 - Sedum 'Dark Magic' - 12-15 in. tall, very upright, clump-forming, numerous crown per plant. Flower heads large, effectively dark pink. Leaves glossy blackish-purple.Terranovanurseries.com, accessed 4.12.2015
SEDU004 - Sedum 'Cherry Truffle'
SEDU005 - Sedum 'Chocolate Drop'
SEDU006 - Sedum 'Raspberry Truffle'
SEDU007 - Sedum 'Desert Black'
SEDU008 - Sedum 'Desert Blonde'
SEDU009 - Sedum 'Desert Red'
SEDU010 - Sedum 'Rolling Rock'
SEDU011 - Sedum spurium 'Red Rock'
SEDU012 - Sedum ussuriense 'Chuwangsan' - 4 in. tall x 12 in. wide, low-spreading. Leaves bluish-green, resembling S. sieboldii but larger and sparsed. Flowers medium lavender-pink.  USDA 3a. Crug Farm found on cliffs in S. Korea as BSWJ23.
--end of OROC Data Sharing

Over 66 Sedum patented so far.....
Selaginella

UPDATED 6.24.2016


SELA001 - Selaginella tamarsicina 'Golden Sprite' ('OK Gold')(Plant Delights)
Sequoia
and
Sequoiadendron
- 44 Sequoia and  85 Sequoiadendron cultivars

Monumental Trees (website, gallery) - numerous photos of both new and old cultivars

The Conifer Treasury 5.0 by Mesterhazy (website, cultivar checklist) - very large, impressive checklist of cultivar with links to Google photos and thousands of original photos, much of the cultivar not in British and US conifer literature.
Sempervivum
Plant Jewels of the High Country by Payne (book, Amazon) - the first Semp book based on American collections and Helen Payne through this work and her nursery helped trigger a wave of Semp collecting taking up where Purdy had left off. As a young man I assembled 334 taxa, some from her nursery, and now today I still grow and trade 150 or so. She inspired a hobby for some, nurseries for others, and encouraged several people to take up breeding work.


UPDATED 6.24.2016


This a chart verison of SEMPERFILE described below but lacks the database functions of the XLS spreadsheet.

An Introduction to Semperviuvm and Jovibarba Species and Cultivars by Willis (book, Amazon)

Sempervivum Cultivar Evaluation with Dr. Kevin Kaughn (Youtube video) - interesting discussion from one of the top American breeders, whose cultivars are spectacular due to his high standards and scientific training.

Fernwood Nurseries (nursery catalog website, catalog reference) - lots of good descrioptions and images from a proven grower and collector

Sedumphotos.net - lots of good Semp photos that even a serious collector will appreciate

The Sempervivum and Jovibarba Handbook by Mitchell (book, Amazon) - a classic in the field from one of the top collectors, breeders, and a former Registrar. This book is hard to find from time to time so check all the online book vendors.


460 species, subspecies, varieties, subvarieties, and cultivars selected
by name, rosette size, cutlivar group/species, vestiture/hairs, colors, and more.
Detailed description notes are included. This file is available in XLS, (Excel),
Open Office Calc, dbase, cvs, PDF, and other formats on request. You can also
expand and modify it with your spreadsheet or db software. This database
can be imported to nearly every database and spreadsheet,. viewed on most
 phones, tablets, laptops, netbooks, book readers, and more. This specialized
database is offered from $29.00 on request to ornamentals@lycos.com

Jovibarba -

List of Cultivars by Martin Miklanek (special interest website) - not maintained since 2000 or so but still widely cited as the best or nearly the largest Semp and Jovi checklist. I rate it a tie with following.

Semper-vivum.de (nursery catalog, checklist) - a nice combo of a catalog with very new, superior clones and a smoking-large checklist with images.

RHS Trial Report 2005-2008 Sempervivum (PDF, cultivar trials, evaluation) - very solid attention to precise descriptions, resolving nomenclature, and solid ratings. This PDF will prove very informative to North American collectors.

International Sempervivum Forum (special interest blog, forum) - lots of good data, I tried to join and never heard back - guess my 154 cultivars was not enough to make the cut.
Senecio
Serissa
Hatch's Cultivars of Woody Plants (PDF ebook, New Ornamentals Society)

Setaria
Setcreasia
Silene -
Annual

Sinningia
Registered Gesneriads by The Gesneriad Society  (plant society database, ICRA)

Pacific Bulb Society - Gallery (plant society website, gallery) 

Sinningia and Friends website - loaded with text and image content. Terrific.


Availability of offers in this genus may be limited during winter weather


UPDATED 6.24.2016Cold hardy perennials (USDA 7)

Sisyrinchium

Original cultivar.org key by Larry Hatch

UPDATED 6.24.2016
Skimmia Esveld.nl slide gallery of numerous cultivars
Copyright 2014. Laurence C. Hatch. All Rights Reserved.
Smilacina
SMIL001 - Smilacina stellata 'Blue Dune' (Plant Delights)

SMIL002 - Smilacina japonica 'Snow Dragon' - 12 in. tall. Leaves margined and lightly striped cream to 5-10% surface, this chimera quickly becoming white. USDA 4a hardy or better. plantdelights.com, accessed 5.26.2015
--end of OROC Data Sharing

UPDATED 6.24.2016
Smithiantha
Registered Gesneriads by The Gesneriad Society  (plant society database, ICRA)
Solandra
Solandrum
Solanum -
Annual
Bedding


Solanum 'Jupiter' (Beekenkamp)
Soleirolia
Solidago
and
x Solidaster

Solidago stricta 'Sceptre'

Solidago shortii 'Solar Cascade' (Plant Delights)

--end of OROC Data Sharing


UPDATED 6.24.2016
Your computer, tablet, phone, or book reader can have the latest cultivar encyclopedia for each genus in handy PDF form - the most complete cultivar references for more than 103 ornamental, landscape genera. CULTIVAR.ORG is a product of more than 35 years of work by leading horticultural taxonomist Larry Hatch and the hundreds of experts in the New Ornamentals Society and our expert partners around the world. We exceed your familiar plant manuals, horticultural society "complete" guides, and most websites by 3-20 times more cultivars and with much more specific, detailed data. For example, 159 Aucuba cultivars, 191 Astilbe, 274 Aquilegia, 109 Ajuga, 1032 Acer, 59 Abelia, 175 Aglaonema, and 103 Aesculus. Click logo above for more details.

If you prefer to purchase volumes separately our Google Play Books Store has many of the same files for $7.20 to $20.00 each. CULTIVAR.ORG is however about 60% less expensive since you are mass-purchasing access at the Preferred Library Rate.
Sophora
(Styphnolobium in part)


SOPH001 - Sophora japonica 'Winter Gold' ( 'Gold Standard') (Esveld Nursery) - twig and young stems very rich gold in winter. Leaves pale green to yellow in spring, later more green.  Intro. to US by Don Shadow, imported from Japan. Not seen in the US until 2013, still not widely sold (May 2015). 

Sorbaria
UPDATED 6.24.2016
Sorbus
including
x Sorbaronia

SORB001 - Sorbus AUTUMN SPIRE« 'Flanrock' (Bluebell Nursery) - 4m tall x 1m wide (10 years), narrow to columnar, erect, compact. Leaves in fall  rich red to orange shades, often very showy in fall. Fruit mustard yellow, reddish centers. Seedling from 'Joseph Rock'.

more from the Esveld Sorbus gallery
--end of OROC Data Sharing


Sorghastrum



PENDING - 'Bantam' and 'Red Spike'         

SORG001 - Sorgastrum nutans 'Active Volcano' - 60cm tall in leaf, 100cm tall in flower, shorter than many clones. Leaves a mix of orange, gray, pink, dusky red, and amber shades in fall. Selected by Jan Spruyt, vasteplant.be, accessed 5.16.2015, under their JS« trademark used for many genera.                     
SORG002 - Sorgastrum nutans 'Winnetou' - 100cm tall in leaf, 180cm tall in flower. Leaves a mix of brownish-red, green, and violet in fall. Flower much longer than species typical. Selected by Jan Spruyt, vasteplant.be, accessed 5.16.2015, under their JS« trademark used for many genera.                     
SORG001 - Sorgastrum nutans 'Winnetou's Squaw' - 60cm tall in leaf, 150cm tall in flower. Leaves blue when flowering. Flowers rich brownish-red shades. Selected by Jan Spruyt,
vasteplant.be, accessed 5.16.2015, under their JS« trademark used for many genera. The ICNCP prohibits offensive names and in popular culture (USA, May 2015) the word "squaw" in considered offensive to some for it's historical, pejorative, anatomical meaning in some native tribal languages but it also means "wife" or "soul mate" with much respect. OROC currently accepts this name as cultural meanings are diverse and there is no universal cry to remove use of the term "squaw". The American states of Idaho, Maine, and Montana have opted to remove "squaw" in place and street names.
--end of OROC Data       
Spathiphyllum
HITS (House, Interior, Tropical, Succulent) Plants by Hatch - 2013-15 Early Preview Edition (PDF ebook, 400+ pages leading to 1300 pages in 2017)

International Aroid Society - Cultivar Database Listing by Burch (website, plant society, ICRA cultivar register) - official cultivar register



Sphaeralcea New addition 11.26.2014
Spiraea Manual of Woody Landscape Plants by Dirr (book, Amazon) - very useful evaluations of cultivars, many quite new, from one of the top experts


Spiraea media SNOWSTORM. Click image to enlarge.


Spiraea japonica with Coloured Leaves Bulletin (PDF article, RHS Trial Report)




SPIR001 - Spiraea media BLUE KAZOO« 'SMSMBK'  (Spring Meadow Nursery) - 2-3 ft. tall x wide. Leaves glaucous blue at first, later more greenish-blue with some red tints, appearing a bit lavender-purple to blue-green from a distance,  later more green. Flowers white in large domed corymbs. Cold hardy to -40 deg. F. Marketed by Spring Meadow Nursery and Proven Winners./

SPIR002 - Spiraea x bumalda SUPERSTAR™ 'Denistar' - 24-36 in. tall x 36-48 in. wide, vigorous yet compact, much smaller than parent 'Froebelii'. Leaves with scarlet to dark red new growth, becoming a darker green than this species old choices, fall shades in copper to bronze, often very showy. Flowers in corymbs in rich violet-pink, fairly typical of modern hybrids from images. US Plant Patent #22432 to Denis Levac in 2012 as sport of 'Froebelii' in 2004.

SPIR003 - Spiraea LIGHTNING STRIKE™ 'Conalex' - 18 in. tall x 30 in wide, very compact to dwarf, mounded. Flower inflor. of 12-20 flowers, to dark to medium pinkish-mauve (parent 'Lemondrop' is more medium pink, less mauve), slightly darker centers, some rebeat blooming in summer.  Leaves  lime green tinged golden-yellow to chartreuse-yellow, may be light green in shade, resistant to sun damage more than 'Lemondrop'.. US Plant Patent #21473 , Selected by Mike Farrow, Holly Hill Farms, Maryland, USA as chance seedling of 'Lemondrop', which Farrow also patented in 2004.

SPIR004 - Spiraea 'Sparkling Champagne' - 1-2m tall x 1.5-2.0m wide, dense, multi-stemmed. Flowers white with distinct violet-red eyes, red stamens, will rebloom is lightly sheared. Leaves light to mediium green, fading to lime green, tips orangish-red at first, another reason to shear it after the first bloom period, fall colors include yellow, lime, and fiery orange to light red shades. Bred by Peter Moore, bredbypetermoore.co.uk, accessed 5.28/2015, using S. hayatana x S. japonica

SPIR005 - Spiraea nipponica GOLDEN GLITTER™ 'Verspi1' - 3-4 ft. tall x  wide, dense, compact. Flowers near white, flat-faced, big near old centers, petals very orbicular, like miniature Potentilla in white but in large heads. Leaves light yellow finely speckled and spotted medium green to lime, a true chimeral variegation, not gold or lime suffusions as other clones, new tips mostly yellow, overall a chartreuse look, technically green glitter on a gold base. US Plant Patent #25098 to Bert Verhoef, Netherlands on Nov. 25, 2014 as sport of S. nipponica 'Halward's Silver'

SPIR006 - Spiraea GOLDWING™ 'Bridixsept' - much as 'Little Princess' but leaves rich golden-yellow, paler by summer, not-burning. Andre-briant.fr, accessed 5.21.2015.
SPIR007 - Spiraea japonica MAGNUM ROSE™ 'Brolanspi' - 2m tall x 1.5m wide, robust, vigorous, very strong for the species, elegant. Flower corymbs bright pink to mauvish-pink, later fading nicely to pale pink. Leaves light green, tipped red in spring, later green, yellowish in fall. Andre-briant.fr, accessed 5.21.2015.
--end of OROC Data Sharing
Spiranthes
Stachyrus
 
STAC001 - Stachyurus praecox 'Sterling Silver' (Nurseries Caroliniana) - white margined leaf.

STAC002 - Stachyurus praecox 'Diane' (Nurseries Caroliniana) - pink flowered, near red markings

STAC003 – Stachyurus chinensis 'Goldbeater' – new growth rich gold, becoming greener. Esveld.nl, accessed 4.24.2015
STAC004 – Stachyurus chinensis 'Wonderful Image' – leaves very faintly mottled, blade narrower, more acuminate Esveld.nl, accessed4.24.2015
STAC005 – Stachyurus chinensis 'Joy Forever' – leaves broadly margined yellow to 45% surface, central green zone an irregular tree shape, margins tinged pink in fall Esveld.nl, accessed 4.24.2015
STAC006 – Stachyurus chinensis 'Senna' -
STAC007 – Stachyurus himalaicus 'Dolly' – 3m tall (10 years).  Flowers yellow, often cream in common species variants. Esveld.nl, accessed 4.24.2015
STAC008 - Stachyurus chinensis 'Carolina Parakeet' - Petioles pinkish, contrasting. Leaves centrally marked yellow to greenish-yellow, subtle chartreuse, 45-80% of blade surface, the central zone sometimes well defined, other times 3-5 lobed and more asymmetrical lower portion of midrib above often red to pinkish. Found by Tim Alderton, JC Raulston Arb, as reverse sport of margined 'Magpie'.

Stachys
UPDATED 6.24.2016
Staphylea
Stauntonia
Stephanandra
Stewartia

Jan de Langhe


Application of AFLP Markers on Taxon Discrimination of Cultivated Stewartia by Nair, Zhang, and Hu (PDF article, HortScience) - interesting high-tech study that includes some cultivars including 'Umaine', a new introduction

Stewartia in Cultivation by Hsu, Boland, and Camelbeke (PDF article, The Plantsman, RHS) - very nice paper, interesting images


'Scarlet Sentinel'
Stipa
UPDATED 6.24.2016
Stokesia Gettys, L.A. and D. J. Werner. 2002. Stokes Aster. HortTechnology 12:1: 138-142. (a very fine, academic quality overview of the species origin, classificaiton, environmental requirements, existing cultivars, garden pests, genetics, propagation, and reproductive biology)

Gettys, L.A. and D. Werner. 2001. Genetic diversity and relatedness among cultivars of Stokes aster. HortScience 36(7): 1323-1326

Gaus, J., D. Werner, and S. Tallury. 2005. Polyploidy in Stokes aster. HortScience 40(4).

Gaus-Barb, J. , D. Werner, and S. Tallury. Cytognetic characterizatrion and nuclear DNA content of diploid andf tetraploid forms of Stokes aster. HortScience 42(7)L 2005-2012.


UPDATED 6.24.2016


'Colorwheel'
'Mel's Blue' - US Patent #23090
'Purple Pasasols'
'Purple Pixie'

STOK001 - Stokesia laevis 'Divinity' (White Flower Farm)
--end of OROC Data Sharing
Streptocarpus
Streptocarpus by Dibley and Dibley (book, Amazon, Wisley Handbooks) - well-received book from the leading British authorities whose website is also a great reference.

Streptocarpus by Hilliard and Burtt (book, Amazon)

Registered Gesneriads by The Gesneriad Society  (plant society database, ICRA)

The following websites are valuable for new and other unregistered cultivars:
Strepocarpus search - general (cliick logo)

Kathystrep - a noted, famous online store (click logo)



Neil's Strep's is another superb, famous vendor, also known for new and rare cultivas,many from his own breeding program.



Streptocarpus Ladyslipper™ Series (GreenFuse Botanicals)
Styrax
Stryax in Cultivation by Matt Lobdell (RHS Plantsman) - paid subscription only. That said, his full dissertation including cultivar studies from the University of Delaware is free online here .


STYR001 - Stryax japonicus MARLEYS PINK PARASOL« 'JLWeeping' (Bailey Nurseries) - combines weeping habit and true pink flowers. Trademarked confirmed registrated in US by OROC search at uspto.gov
STYR002 - Styrax japonicus 'Evening Light' (Hawksridge Farms)
STYR003 - Styrax japonicus 'Jippei-Kawamure' (Esveld Nursery)
STYR004 - Styrax japonicus 'Peter Pan' (Esveld Nursery)
STYR005 - Styrax japonicus 'Spring Showers' (USDA/USNA)
STYR006 - Styrax americanus 'Baby Blue (JC Raulston Arboretum)
STYR007 - Styrax japonica 'Frosted Emerald' - slower than species typical. Leaves heavily mottled cream in very irregularly pattersn, some random, others near margin with some submarginal banding.

STYR008 - Styrax japonicus 'Bombastic' -     Esveld.nl, accessed 4.24.2015
STYR009 - Styrax japonicus 'Tinkerbell' - smaller tree, 3m (10 years). Leaves smaller,
 refined, often slightly folded. Esveld.nl, accessed 4.24.2015



STYR010 - Styrax japonicus 'Wespelaar' - leaves very wide, much as 'Fargesii', green, becoming more brownish-purple in fall. Flowers numerous, white, very showy. Selected at Arboretum Wespelaar, Belgium, but not listed under their own selections of cultivars on their website, accessed 5.20.2015. Offered by panglobalplants.com and esveld.nkl on this same date.

Styrax japonicus 'Lady Bell' - known from the J.C. Raulston Arboretum Accession# 044282 on 12/12/2014

Styrax japonicus f. rubricalyx 'Hyme' - flower calyx and pedicel pink to red-tinged. In: Larch Cottage Nursery, England.

Styrax japonicus 'Fat Man' - subglobose, compact, semi-dwarf. Or: John Allen, Shiloh Nursery, Harmony, North Carolina, USA


---END OF OROC DATA SHARING
Sycopsis
and
x Sycoparrotia
Symphoricarpos
Synadenium
Syneilesis
SYNE001 - Syneilesis palmata'Kikko' (Plant Delights) - a spectacular variegate with a cut palmatifid leaf.
Syngonium
147 cultivars

AFLP Analysis of Nephthtis Selected from Somaclonal Variations by Chen, Henny, Devenand, and Chao (PDF article, Springer) - can't find a free copy online so this must be purchased for staggering $39.95! Nineteen cultivars including classic and recent ones are compared.

International Aroid Society - Cultivar Database Listing by Burch (website, plant society, ICRA cultivar register) - official cultivar register

Nephthytis Cultivars to Know and Grow by Henley and Robinson (PDF article, Proceeding Florida State Hort. Soc.) - 1993 paper that is perhaps the first to document the new material in solid morphological detail.



Syngonium 'Confetti' (Agristarts)
Syringa Lilacs: A Gardener's Enycyclopedia by Fiala and Vrugtman (book, Amazon)

International Register (Freek Vrugtman). There are separate registration pages from HortScience including:
- 2003
- 2005

Lilac DVD by Zelimir Borzan and Charles Holetich - covering over 950 taxa and 2600 images, this massive compilation was made with the assistance of 19 contributors from around the world.

The Joy of Lilacs by Mike Dirr - a wonderful article on the state of the genus in terms of southern gardens and their work to breed new, durable, pretty clones. There is even fall foliage color in the works and that's a neat place this genus has rarely gone before.

Esveld Nursery - Syringa cultivar gallery - highly useful with over 300 images

Syringa + Cultivar
Syringa + Taxonomy



The Everblooming Lilac Controversy by Larry Hatch - a review of literature on the new which may or may not capture your fancy for the genus in your childhood and in your current garden.

The Genus Syringa: Molecular Markers of Species and Cultivars by Kochieva et al. (PDF article, Russian Journal of Genetics)

Tree Lilac Cultivars Tested as Street Trees: Initial Results by Gerhold (PDF article, Journal of Arboriculture)

International Lilac Society

Lilacs by Fiala and Vrugtman (preview only)


The Lilac: A Monograph by McKelvey (PDF ebook, Archive.org) - this 1928 classic is very hard to find (occasional copies show up at Amazon for $85-230) but thanks the Syringa Registrar Freek Vrugtman we now know it's 100% free for viewing and download via The University of Connecticut on Archive.org. Now one of the finest, more precise horticultural monographs of the past century can be in everyone's library and our portables libaries at that.

BLOOMERANG« by Proven Winners


Syringa SCENT AND SENSIBILITY™
Syringa BLOOMERANG™ DARK PURPLE - a darker version of that original, flowers larger, rounder, and also on a bigger plant of 4-6 ft. tall.



COPPER CUIRLS«
'Betsy Ross', 'Old Glory', and 'Declaration'

S. emodii 'Aureovariegata' (Plantsmans Corner) - a lovely view of this very rare, huge-leafed, variegated lilac
Tagetes
Talinum
Tamarix
Tanacetum
Taxodium
Pinetum Novum by Hatch - 93 cultivars (New Ornamentals Society)


RHS Encyclopedia of Conifers (book) - numerous cultivars and stunning photographs


The Conifer Treasury 5.0 by Mesterhazy (website, cultivar checklist)

Taxodium: One, Two, or Three Species? Evidence from DNA Sequences and Terpendoids by Adams, Arnold, King, Denny, and Creech (PDF article, taxonomy, DNA analysis, Phytologia) - this is hopefully the final word on species level bald-cypress taxonomy which is very important for sorting out our cultivars. This panel of Taxodium experts is the best ever assembled and they consider it a monotypic genus resepresented by three varieties, var. distichum, var. imbricarium, and var. mexicanum.Why not subspecies?


TAXO001 - T. distichum LINDSEY'S SKYWARD™ 'Skyward' (Monrovia)

TAXO002 - Taxodium distichum 'Cody's Feathers' (JC Raulston Arboretum)

TAXO003 - Taxodium 'Banita' (T. distichum x T. mucronatum) - 80 ft. tall x 40 ft. wide in China, Texas plants at SFA were 14 ft. in 3 years, vigorous, neat form, not producing knees. Leaves light emerald green, evergreen in USDA 8, less so in USDA 7. Reduce\d Cercospora leaf blight. Hardy to USDA 7. Origin: China, controlled hybrid, introduced to US by Dr. David Creech, Stephen F. Austin State University, tested there as T502. We first say it sold as mailorder by www.camforest.com, accessed 4.13.2015.

TAXO004 - Taxodium distichum 'Boxer's Path' - compact, sport of witches broom, 2-4 inches a year.Found by Mr. Umar in Philadelphia, Pennsylvania, USA not far from the Museum of Art make famous by bozer Rocky Babloa of movie fame and a statue there today. Conifertreasury.org, version 7.0, accessed 5.29.2015.

TAXO005 - Taxodium distchicum 'Jims Little Guy' - dwarf  to semi-dwarf, erect, tufted and cloud-like at times, generally on the theme of 'Peves Minaret' but in some ways different, too early to define in detail. Found at JBerry Nursery, Grand Saline, Texas as broom seedling. Taxodium expert Dr. David Creech says it can be rooted with careful cutting selection unlike 'Peve Minaret' (which is grafted and thus rare) and thus has potential for wider use.

TAXO006 - Taxodium distichum 'Twisted Logic' - twigs contorted, very showy in winder. Tom Cox, Georgia, found as seedling. coniferkingdom.com , accessed 5.29.2015

TAXO007 - Taxodium distichum APACHE CHIEF« 'Nelson' - 50 ft. vigorous, puramidal, later more broadly spreading, dependable central leader, wider than 'Shawnee Brave'. US PP# 12502, widely known to date as 'Nelson', this trademark name not widely seen before. Offered by www.heritageseedlings.com, online Wholesale Catalog 2015-2016 (PDF), accessed 2.16.2016

Taxodium distichum var. ascendens FOX RED™ 'Red Fox' - narrower (columnar-conical) as variety or subspecies, rich bronze to bronzy-red fall colors. Or: Bartlett Trees, Charlotte, North Carolina  In: www.boldspring.com, accessed 2.28/2016   


-----end of OROC Data Sharing


Taxodium distichum 'Cody's Feathers' (JC Raulston Arboretum)

Taxus
RHS Encyclopedia of Conifers (book) - numerous cultivars and stunning photographs

Pinetum Novum by Hatch - 353 cultivars (New Ornamentals Society)


The Conifer Treasury 5.0 by Mesterhazy (website, cultivar checklist) - very large, impressive checklist of cultivars but not including the Spjut taxonomy.

Esveld Nursery - Taxus image gallery

Electrophoretic Characterization of Taxus Cultivars by Greer et. al (PDF article, HortTechnology) - one of the first (1993) scientific studies of Taxus cultivars, covering some 55 taxa.

Overview of the Genus Taxus by Spjut (taxonomic website) - a radical revision of the genus' taxonomy that incoporates new names for cultivars and cultivar groups. Very interesting and not accepted by every conifer expert but the research is very detailed and convincing to me. Irish, Hicks, Japanese dwarf, and other important cultivar groups are impacted by this new system. Dr. Spjut also provides ID keys of immense value.

Holly,Yew, and Box by William Dallimore (PDF ebook from Google Books) - this is the first work on the genus in gardens with a thorough understanding of the great Kew collections and details on history of the older material


'Keumbitnoeul'


TAXU001 - Taxus baccata 'Intermezzo' (Buchholz Nursery)
TAXU002 - Taxus caespitosa 'Rezek's Gold' (Plant Delights, formerly T. baccata 'Aurescens Nana')

TAXU003 - Taxus cuspidata (Capitata Group)  GOLDEN JEWEL™ 'KNI9901' - 10-15 ft. tall x 4 5-6 ft. wide, pyuramidal, foliage bright yellow into summer, green later on. Offered by http://www.klynnurseries.com, 2013 Catalog/No Pricing, accessed 2.17.2016, their own introduction, found in a lot of 'Capitata' seedlings, trialed for "many years"

TAXU004 - Taxus cuspidata GOLDEN TREASURE™ 'KNI9902' - 3-5 ft. tall x 5-6 ft. wide, archig-spreading, similar to Pfitzer juniper habit, new growth bright gold, sunburn resistant. Offered by http://www.klynnurseries.com, 2013 Catalog/No Pricing, accessed 2.17.2016, their own introduction

Taxus cuspidata (Capitata Group)  GOLDEN JEWEL™ 'KNI9901' - Offered by http://www.klynnurseries.com, 2013 Catalog/No Pricing, accessed 2.17.2016, their own introduction

Taxus cuspidata GOLDEN TREASURE™ 'KNI9902' - Offered by http://www.klynnurseries.com, 2013 Catalog/No Pricing, accessed 2.17.2016, their own introduction
Tellima
Ternstroemia
Hatch's Cultivars of Woody Plants - 18 cultivars (New Ornamentals Society)


LEANN™, BIGFOOT,™ BRONZE BEAUTY™ (click logo below)



Ternstroemia gymnanthera 'Worthington Compact' is not only a very tight. circumspect, subglobose mound, lacking all of the species conquering motivations, the smaller, more refined blades are a lovely range from purplish-olive to glowing burgundy in winter as shown above. While still rare, I think it above most of the newer, hyped clones.

TERN001 - Ternstroemia gymnanthera 'Golden Bear' - registration based on palnt at JC Raulston Arboretum, Raleigh, North Carolina , USA accessioned as 120829 in 2012.
--end of OROC Data Sharing
Tetrapanax
Teucrium
Thalictrum
T

H
--end of OROC Data Sharing
Thelypteris

Thelypteris glanduligera 'Green Shag'. Click image to enlarge to 1250 pixels wide.
Thuja
excluding
Platycladus

Hatch's Cultivars of Woody Plants - 400+ cultivars (New Ornamentals Society)


RHS Encyclopedia of Conifers (book) - numerous cultivars and stunning photographs


The Mystery of Thuja occidentalis 'Sudworth' or 'Sudworth Gold' by Larry Hatch
Coming soon.

Globose Variations of Thuja by Hatch (youtube video, plant society website) (click logo below)


The Conifer Treasury 5.0 by Mesterhazy (website, cultivar checklist) - very large, impressive checklist



Our nomenclatural standard for 400+ cultivar is Hatch's Cultivars of Woody Plants
THUJ001 - Thuja occidentalis 'Park Vlaanderen' (Buchholz Nursery)
THUJ002 - Thuja occidentalis GOLDSTRIKE™ (Wayside Gardens)
THUJ003 - Thuja (standishii x plicata) EMBER WAVES™ 'MonPin' (Monrovia, New 2015)
THUJ004 - Thuja occidentalis 'Golden Anne' (newplants.nl)
THUJ005 - Thuja (plicata x standishii) VIRGINIAN  (Upshoot)
THUJ006 - Thuja occidentalis POLAR GOLD™ 'SMTOYB' - 144-188 inches tall, narrowly pyramidal, more vigorous than 'Sunkist', dense, much as 'Brandon' in form. Leaves yellow to gold all year, resistant to wind burn. USDA hardy to zone 3, more so than 'Sunkist'. US Patent #25388 on March 31, 2015 to Tim Wood, assigned to Spring Meadow Nursery, cross of 'Brandon' x unnamed male parent 2003, selected 2007.
THUJ007 - Thuja occidentalisd 'Nuclear Blast' - 4-6 ft. tall x 3-4 ft. wide, irregular, foliage whi-like, filiform, a mix of adult and juevnile foliage types. Offered by http://www.klynnurseries.com, 2013 Catalog/No Pricing, accessed 2.17.2016, their own introduction
--end of OROC Data Sharing
Thunbergia
Thymus The Thyme Handbook, The Big Book of Thyme, and International Thymus Register by Easter (book, PDF, LW Plants) - two references from the International registrar who also has the world's largest collection of cultivars, about 425 taxa

Big Book of Herbs by Tucker and deBaggo (book, Amazon) - very useful identification to major cultivars

LW Plants (nursery catalog website) - Margaret Easter's wonderful catalogue of thymes, including own originations. See has many useful articles on cultivar identification and nomenclature at this link:
http://www.thymus.co.uk/plant_heritage_articles1.html
includes original NOS Trials images and some new cultivars not in other American literature.



Thymus 'Spicy Orange is not the same as Richter's trademarked ORANGE SPICE™ but it's scent is in the ballpark. I love this thyme because it is very un-thyme-like in that it smells more like a mint and has pretty, narrow, pale leaf with elegant habit. Thymes smell like lemons already and now they also take on real orange, geranium, rose, and even oregano chemistry. I learn as I grow older that pretty much any herb genus with enough selection and breeding can produce the main notes of fruit and other herbs given half a chance. Lots of chemicals can be drawn out from their DNA and it's merely a matter of maximizing one over the others to get odd new cultivars that are sometimes callled Chemotypes.
Tiarella
Tibouchina
Tibouchina 'Peace Baby', 'Allure', 'Groovy Baby', etc. (Plants Management, Australia) - the finest new hybrids, floriferous, compact and even dwarf. See the website and the video below.

Tilia

Jan de Langhe



TILI001 - Tilia 'Jubilee' (Esveld Nursery)
Tolmiea
Torenia
Torreya

TORR001 - Torreya nucifera 'Snowcap' (Camellia Forest)
Trachelium
If you prefer to purchase volumes separately our Google Play Books Store has many of the same files for $7.20 to $20.00 each. CULTIVAR.ORG is however about 60% less expensive since you are mass-purchasing access at the Preferred Library Rate.
Trachelospermum
Hatch's Cultivars of Woody Plants - 56 cultivars (New Ornamentals Society)





TRAC001 - Trachelospermum asiaticum 'Atsuba Chirimen' - image below is not part of OROC Data or Image Sharing.

TRAC002 - Trachelospermum asiaticum FLAT MAT (Ozbreed). Please click video below.
Trachycarpus Plant Delights Nursery - Perennial Encyclopedia
Tradescantia
virginiana

and
Andersoniana
Group

Hatch's Perennials 1.0-3.0 - 95 cultivars (PDF ebook, New Ornamentals Society)#344228


RHS/AHS Encyclopedia of Perennials by Rice (book, Amazon)


TRAD001 - Tradescantia 'Angelic Charm' (Terra Nova Nurseries)

TRAD002 - Tradescantia AMETHYST KISS™ (North Creek Nurseries)

A Comparative Study of Tradescantia Cultivars by Richard G. Hawke (PDF article, Chicago Botanic Gardens, cultivar trials, plant evaluation)
Tradescantia
- Tropical
or Interior
(see also
Setcreasia)

Tradescantia cerinthoides 'Greenlee'
Tricyrtis 57 cultivars


RHS/AHS Encyclopedia of Perennials by Rice (book, Amazon)

Farmyard Nurseries (website, NCCPG Collection, gallery)

Plant Evaluation Notes by Hawke (article, Chicago Botanic Garden)



TRIC001 - Tricyrtis hirta var. masomunei 'Precious Metal'. Click to enlarge image to 1250 pixels. Image may be used on OROC data terms if no modification to size or content is made.
Trifolium
'Frosty Morning', 'Patchwork Quilt', 'Irish Mist', and 'Pistachio Ice Cream' Ornamental White Clover (Trifolium repens) by Tachiro (PDF arfticle, cultivar release, HortScience) - the HortScience release of four named clones from the University of Georgia, all of which are variegated and multicolored plants. Very cool stuff. Dr. Tachiro's thesis covers this stock and discussions of other, existing garden clones including 'Dark Dancer' and 'Dragon's Blood'.




Trifolium (repens?) 4 LUCK« Series including GREEN GLOW, COCO MINT, and RED GREEN (Greenfuse) - the GREEN GLOW clone with mint green and dark emerald green is absolutely unique and lovely.



TRIF001 - Trifolium (repens?) 4 LUCK« GREEN GLOW (courtesy of www.green-fuse.com)
Click image to enlarge.
Trillium Trilliums by Case, Case, and Case (PDF, Amazon) - 45 taxa

Trilliums in Woodland and Garden by Jacobs and Jacobs (book, Amazon) - the better of these two books for cultivar data from Don Jacobs who has selected many of the best modern, named clones

Hatch's Perennials 1.0-3.0 - 131 cultivars + more botanical taxa (PDF ebook, New Ornamentals Society)



Holmes Trillium Research

Plant Delights - Gallery by Avent (website, gallery)

Trillliums.co.uk



click image to enlarge
Trollius
Hatch's Perennials 1.0-3.0 - 56 cultivars (New Ornamentals Society)


RHS/AHS Encyclopedia of Perennials by Rice (book, Amazon)
Tropaeolum
Tsuga

Original cultivar.org key by Larry Hatch
Cultivated Hemlocks by Swartley, Welch, and Dudley (book, Amazon) - the authoritative work based on Swartley's doctoral dissertation at Cornell, his later writings, and the work of other scholars such as Humphyrey Welch. Used copies often sell for $3-10 so this is an easy acquisition.




RHS Encyclopedia of Conifers (book) - numerous cultivars and stunning photographs




USDA - ARS - US National Arboretum - Drs. Pooler and Olsen - Evaluation and Genetic Improvement of Woody Ornamental Landscape Plants for Disease and Pest Tolerance, Non-invasiveness, and Ornamental Traits


TSUG001 - Tsuga canadensis GOLDEN DUCHESS™ 'MonKinn' (Monrovia) - a golden weeper at last? maybe not but certainly closer than anything before.

Sargent's Weeping Hemlock Reconsidered by DelTredici (PDF Article, Arnoldia, Harvard University) - a review of current knowledge on the weeping hemocks seedlings and the origins of the Pendula Group. If you enjoy cultivar history this is a very fascinating article.

Potential Hemlock Hybrids Tolerant of Invasive Hemlock Wooly Adelgid by Stephanie Yap (PDF article, USDA-ARS, Richard Olsen, Sue Bentz) - a nice, popular summary of genetic and forestry work to save our natvie hemlocks from a deadly attack.
Tulipa
Tulipa-DB in NODgeo by Hatch (XLS spreadsheet, database, plant selection, New Ornamentals Society) - XLS tool to select cultivars and species by traits.This is included when NODgeo is ordered.

The Tulipa-DB data has been sorted by cultivar name and put into a useful PDF chart:

KAVB Dutch cultivar register - the official database of bulb cultivars, loaded with detailed desciptions, history and origins. This link may not work currently in 2013.

Nederlands Rassen Register - 1989 cultivars - this is a prefiltered list.


'Cash'
'Ice Age'
'Double Sugar'
'Sunny Prince'
'Happy People'
'Blueberry Ripple'
'Match'
'Winnipeg'

Lost Tulips by Eric Breed (special interest website, gallery, heirloom cultivars) - a lovely set of images of cultivars dating back some centuries!

Oldtulips.org - an outstanding and very sophisticated resource and a good model for other genera.

Tulips: Species and Hybrids for the Gardener by Wilford (book, Amazon)

Tulips For North American Gardens by Heath (book, Amazon)

The Tulip by Pavord (book, Amazon)

Tulipomania by Dash (ebook, nook) - story of how cultivar collecting addiction got way out of hand, single clones selling for more than a house!
Ulmus
North American Landscape Trees by Jacobson (book, Amazon) - it's hard to pick the best and most complete elm cultivar project but this one is about as good as it gets. The following has a few newer clones.

Hatch's Cultivars of Woody Plants - (New Ornamentals Society)



'Meirenyu'



ULMU001 - Ulmus parvifolia 'Blizzard'. Click image to enlarge to 1200 pixels wide.
ULMU002 - Ulmus davidiana var. japonica NORTHERN EXPRESS« 'Burgundy Glow' - 28 ft. tall x 24 ft. wide, smaller to medium sized for the genus, globose to subglobose, somewhat open branching. Leaves medium green in summer, becoming rich apricot orange to dark burgundy red in fall. Resistant to Dutch Elm Disease, minimal black leaf spot damage. Cold hardy to USDA 3. Selected at North Dakota SDtate University, introduced 2014.
http://www.ag.ndsu.edu/plantsciences/research/introductions/northern-empress , accessed 5.12.2015.
ULMU003 - Ulmus americana COLONIAL SPIRIT« 'JFS-Prince II' - 65 ft. tall x 50 ft. wide, upright-arching (classic species vase look), symmetrical over time, strongly branching. Leaves dark green, mixed yellow shades in fall. DED (Dutch Elm Disease) resistant. USDA 4 hardiness. Selected by jfschmidt.com, accessed 5.16.2015, introduced 2016.
---end of OROC Data Sharing

Weird license: Amherst College movng a very large Camperdown elm to establish a new athletic field:



U. parvifolia 'Emerald Prairie'


USDA - US National Arboretum - Dr. Whittemore - Characterization of Elm Germplasm of Horticultural Interest

USDA - ARS - US National Arboretum - Drs. Pooler and Olsen - Evaluation and Genetic Improvement of Woody Ornamental Landscape Plants for Disease and Pest Tolerance, Non-invasiveness, and Ornamental Traits

Registration of Cultivar Names in Ulmus by Green (PDF article, Arnoldia, Harvard University) - the 1964 standard

Updated Checklist of Elm Cultivars for Use in North America by Santamour and Bentz (PDF article, Journal of Arboriculture) - 175 taxa or names

Elm Cultivars by Morton Arboretum (arboretum website, ICRA) - a nice summary of DED resistant clones from the institution that holds the Register




Uncinia
UNCI001 - Uncinia rubra 'Belindas Find' (Skagit Gardens)
Vaccinium

Flora of China

Flora of North America




Vaccinium BRAZELBERRIES Series (new ornamental cultivars)

VACC01 - Vaccinium corymbosum PINK ICING™ 'ZF06--79' - 3-4 ft. tall x wide, mounded to slightly spreading. Leaves semi-evergreen, new growth pink, glaucous blue, and light green, later medium green, very strong plants quite pink in new tips. Fruit large, sweet. BRAZELBERRIES« name not registered with OROC as it is applied to more than one genus and is thus not a taxonomic equivalent.
US patent #23336.
Verbascum
RHS/AHS Encyclopedia of Perennials by Rice (book, Amazon)



Cotswold Garden Flowers (nursery website) - lots of data from one of the originators of breathrough cultivars.

Terra Nova's introductions

VERB001 - Verbascum chaixii 'Croatian Blood' (Plant Delights)
Vernonia
VERN001 - Vernonia angustifolia 'Plum Peachy' (Plant Delights) - 48 in. tall. Leaves linear (as species), somewhat Amsonia-like before flowering. Flowers in open heads to 8 in wide, dark purple, larger heads than species typical. USDA 5a. Selected by Tony Avent  from wild populations near Turner County, Georgia, USA, trailed as A2GA-003B.

VERN002 - Vernonia 'Southern Cross' (Instrinsic Perennials) - 36 in. tall x wide. Leaves dark green, 0.5 in. wide, dark green, remaining clean all season. Flower heads purplish-lavender, white filaments, petals very incised and lacy. Intrinsic Perennials from seed of V. lettermanii, but a blade much wider, likely an interspecific hybrid, introduced 2013.

VERN003 - Vernonia altissima 'Jonesboro Giant' (Plant Delights) - 144 in. tall, large for the genus. Leaves dark green. Flower heads dark purple to rich lilac. USDA 5a. Selected by Tony Avent, Plantdelights.com in 2000, found in wild near Jonesboro, Arkansas, USA, notably erect and sturdy while other seedlings there had fallen over due to climate and flower weight. It remains strong in their trials.

VERN004 - Vernonia crinita 'Betty Blindeman' - 125cm tall, becoming 160cm tall in flower. Flower corolla purplish-lavender to pale lilac. Selected by Jan Spruyt, vasteplant.be, accessed 5.17.2015

VERN005 - Vernonia noveboracensis 'White Lightning' - Flower buds greenish-yellow, opening to white to creamy-white rays, not lavender to purple shades as species. Selected by Jelitto.com, accessed 5.2.2015, their own selection, intro. 2014.
--end of OROC Data Sharing

Verbena

European Garden Flora
Hatch's Perennials 1.0-3.0 - 389 cultivars - (PDF ebook, New Ornamentals Society)


Verbena LANAI« TWISTER PINK



'Homestead Purple'

Penn State Trial Gardens Report (university website, trial gardens, cultivar evaluation) - 473 cultivars - an outstanding study with images
Veronica
and

Veronicastrum

European Garden Flora
Hatch's Perennials 1.0-3.0 - (PDF ebook, New Ornamentals Society)


RHS/AHS Encyclopedia of Perennials by Rice (book, Amazon)

Comparative Studies of Veronica and Veronicastrum by Hawke (PDF article, Chicago Botanic Garden, plant evaluation, cultivar trials)





VERO001 - 'Blue Bomb' by Graham Rice (RHS, Parkers, new cultivar)
VERO002 - 'Aspire' (Terra Nova Nurseries, commercial website)
VERO003 Veronica 'Very Van Gogh' (Walters Gardens)
VERO004 - Veronica incana 'Pure Silver' IInstrinsic Perennais, accessed 4.15.2015
VERO005 - Veronica 'Hotel California' - 24 in tall in flowers.  Leaves green at first, turning red by blooming time and remaining so later, giving a new contrast not normally seen. Flower spikes medium blue. Intrinsic Perennials, introduiced 2015.
VERO006 - Veronica 'Spike' - 12-15 in. tall in flower, foliage before flowering low, compact. Flower spokes very erect and elongated, medium blue to slightly violet-blue. Said to be improved over 'Royal Candles'. Intrinsic Perennials, intro. 2014.
VERO007 - Veronica 'Pure Silver' - 12 in. tall, becoming 15 in. tall or more in flower, plant vigorous, and with improved longevity in borders. Leaves very greenish-silver to pale silver, showy. Flower colorol sky blue at first, made paler by a silvery calyx and peduncle, opening light violet-blue to medium blue. More adaptable to low drainage conditions than most silver-leaved, ie. V. incana cultivars, handling heavy soils and moist, rainy conditions better, hgiher longevity in borders. Intrinsic Perennials, intro. 2009
VERO008 - Veronica gentianoides 'Little Blues' - 15cm tall in flower, very compact. Flower color light blue with darker veins, yellowish center. Selected by Jelitto.com, their own seed strain, intro. 2015.
VERO009 - Veronicastrum
-- end of OROC Data Sharing

'Hocus Pocus' (Proven Winners)


Viburnum

Jan de Langhe

Hatch's Cultivars of Woody Plants - 224 cultivars (New Ornamentals Society


Viburnums by Mike Dirr (book, Amazon) - the classic horticultural monograph, a much-needed gap-filler for the woody plant library

Manual of Woody Landscape Plants by Dirr (book, Amazon) - very useful evaluations of cultivars, many quite new, from one of the top experts


VIBU001 Viburnum SHINY DANCER.

VIBU002 - Viburnum bracteatum ALL THE GLOWS™

VIBU003 - Viburnum obovatum 'Raulston Hardy' (JC Raulston Arboretum)

VIBRU04 - Viburnum dentatum 'Golden Arrow'

VIBU005 - Viburnum plicatum SHARON KAY™ (Upshoot)

VIBU006 - Viburnum LIME MARTINI™ (Upshoot)

VIBU007 - Viburnum tinus ROYAL BABY 'Bridixhuit' - 1m tall x wide, compact, globose to subglobose, dwarf version of species. Leaves more narrow, elliptic-lanceolate to narrow elliptic. Flower heads white, very numerous, umbels to 2cm wide.Andre Briant.

Viburnum burejaeticum MINI MAN™ 'PO17s' - subglobose, semi-dwarf, other same traits as the species Or: Montana Valley Farms, Helena, Montana. In: Scott Skogerboe, Fort Collins Wholesale Nursery via the Plant Select (2015 award, new for 2016 trade). 

--end of OROC Data Sharing

Esveld Nursery - Viburnum image gallery - over 2000 different slides



'Cree' and 'Nantucket'


V. dentatum BLUE MUFFIN™ and CHICAGO LUSTRE™


Viburnum plicatum 'Pink Sensation' remains one of the best, truly pink vibs around. Depending on light conditions, it even has a orangey-coral hue and if we ever get orange vibrunums this would likely be a nice place to start the breeding. This image was from a NOS Card (New Ornamentals Society postcard) and was limited to 399 copies - not a reflection on the plant itself which should be seen in the millions. Click image to enlarge.

VIBU001 Viburnum SHINY DANCER. Photo courtesy of and owned by www. provenwinners.com. Click image to enlarge. This ain't no lousy thumbnail garden page!
Vinca
Hatch's Perennials 1.0-3.0 - 69 cultivars (New Ornamentals Society)




Viola -
Annual
including
Pansy
Suntory VIOLINA« Series
Viola -
Hardy
and Perennial

Violets: The History and Cultivation fo Scented Violets by Coombs (book, Amazon) - the study of outdoor, hardy, scented violets starts with Roy Coombs work here.

RHS/AHS Encyclopedia of Perennials by Rice (book, Amazon)

Hatch's Perennials 1.0-3.0 - 123 cultivars - (New Ornamentals Society)




Evaluation of Viola Cultivars are Bedding Plants and Establishment of the Best-of-Class by Kelly et. al (PDF article, HortTechnology)

The American Violet Society (plant society website, gallery). Their very large checklist dated 2003 by Peter Robinson  John Snocken is found here.

Sweet Violet Plants - Scented and Unusual Rare Plants by Groves Nursery UK (Youtube video, nursery) - a nice slide show of top cultivars

Devon Violet Nursery (nursery website) - a fine reference site

The Book of the Pansy, Viola, and Violet by Crane (PDF ebook, Google Books) - 1908 classic and useful for understanding how our modern cultivars came to be.

Pansies, Violas, and Violets by Jordan, Ballantyne, and Burnie (PDF ebook, Google Books) - from 1898 this is one of the oldest Viola monographs.
Vitex
VITE001 - Vitex agnus-castus DELTA BLUES™ (Wayside Gardens)

VITE002 - Vitex agnus-castus 'Riverbanks White' (Nurseries Caroliniana)

VITE003 - Vitex agnus-castus BLUE DIDDLEY«. Image owned by and courtesy of www.provenwinners.com. Please click on image to enlarge. Do not extract or use this image with OROC data.
--end of OROC Data Sharing


A New Beginning for Vitex by Michael A. Dirr (Nursery Management) - easily the mnost important article on this genus in the horticultural domain. Wonderful, rich insights and a superb cultivar treatise.

44 cultivars + more botanical taxa

Hershberger, A.J. et al. Expression of ornamental traits in container versus field plants in a Vitex L. breeding program. (Hortscience article)
Weigela Manual of Woody Landscape Plants by Dirr (book, Amazon) - very useful evaluations of cultivars, many quite new, from one of the top experts

Cultivar Classification of Weigela by Hoffman (PDF article, ISHS)


A Check-list of Cultivar Names in Weigela by Howard (PDF article, Arnoldia, Harvard University) - the authoritative 1965 checklist which is the basis of all modern studies of cultivars

Esveld Nursery - Weigela image gallery - high recommended


Proven Winners cultivars
'Rainbow Sensation' (Willoway Nurseries)
GHOST™ (Proven Winners)
'Dream Catcher' (Chicagoland Gardening)





WEIG001 - Weigela WINGS OF FIRE™ (Peter van Rijssen). Click photo below. 

WEIG002 - Weigela SONIC BOOM PEARL

WEIG003 - Weigela RUBY FUSION™ (Star) - 3-4 ft. tall x wide. Flower corolla pinkish-red becoming dark ruby red, open campanulate with spreading lobes which are much incised and undulate than common for this genus, stamens cream to white, showy for contrast. Leaves chartreuse to yellow-green, sometimes very yellow in sunny, new tips, the very newest leaves may have very thin ruby red margins, pictotee style which do not last long, calyx lime to chartreuse, also with these dark red edges and tints, the blade finely serrulate and also undulate, broadly so but this almost creating the look of crenations or small shallow lobes.
Bred by NovaFlora LLC, introduced 2014 via Star Roses and Plants.
WEIG004 - Weigela LEMON ICE™ (Lake County Nursery) - pale yellow flowers in early April, showy red stems too.
WEIG005 -Weigela RED TWEETIE BIRD™ (Lake County Nursery) - dark green leaf, bright red flowers on strong plants of 4 ft. tall.
WEIG006 - Weigela MOR-COLORFUL™ 'Morcolzam' - 4 ft. tall x 5 ft. wide, subglobose, compact. Leaves broadly margined greenish-yellow becoming more creamy-yellow, chimera about 20-35% surface, slightly rugose, reminding one of a good Cornus florida variegate. Flowers light pink in bud, opening all white.USDA 5.Lake County Nursery, intro. c. 2013.
WEIG007 - Weigela 'Blazeaway' - 30-40 cm  tall x 50cm wide, originator likes it grafted high on 'Bristol Ruby' for standard 1.5-2.0m tall, forming an arching, cascading show plant. Flowers medium pink,. very tubular, Digitalis-like, often rebllooming later in summer. Bred by Peter Moore, UK 1990 as species W. florida x 'Evita'. Leaves medium green, tinged medium to dusky dark red in fall, showy.
WEIG008 - Weigela ALL SUMMER RED™ or CRIMSON KISSES™ 'Slingco 1' ('Slinco', 'Slingco')  - 3 ft.tall x wide, compact to semi-dwarf (more so than parents 'Red Prince' and 'Evita'), subglobose Leaves green. Flowers rich pinkish-red to medium crimson-red to medium-violet- red, definately more than cherry or tomato tones here, much pink to violet in the background, well named for "lipstick red" kisses, commercially thought in the cosmetic industry to be something of a hot magenta-red ot glowing rose-red (May 2015). USDA 4 hardiness. US Plant Patent #23654 on June 11, 2013 to Gijsbertus Verhoef, Hazerswoude, Netherlands 2005, cross of 'Evita' and 'Red Prince', selected 2007. The originator Bert Verhoef, bertverhoef.com, accessed 5.28.2015 uses the ALL SUMMER RED™ trademark while Monrovia has used CRIMSON KISSES. The various spellings of the cultivar name, including on the originator's website, can lead to confusion. 'Slingco 1' is what appears in the US Patent Office records.
WEIG009 - Weigela MAROON SWOON™ 'Slingo 2' - 1.3-1.5m tall x 80-100cm wide, much taller than the originator's CRIMSON KISSES™, upright-rounded, compact. Flower corolla color dark rich red all year, uniformly colored, stamens white to cream, contrasting. Leaves dark green. Selected by Gijsbertus Verhoef, Netherlands. Connonnurseries.com, accessed 5.27/2015
WEIG010 - Weigela TUXEDO™ or EBONY AND IVORY™ 'Velda' - 80-100cm tall x 1.0-1.3m wide. Flower corolla color near white, campanulate, semi-open among modern hybrids, calyx much as the leaves, generally a dark burgundy-purple in full anthesis, throat slightly gold or yellow tinged but not bodly so, a small gold throat or stripe at best, semi-showy as such for contrast. Leaves very dark brownish-purple appearing near black, the cultivar name being a contrast black and white as with the tuxedo or "black tie and tails" approach to fancy, formal dress.Bred by Gijsbertus Verhoef, Netherlands.Mr. Verhoef aty bertverHoef.com, accessed 5.28.2015, uses the EBONY AND IVORY™ trademark. 
WEIG011 - Weigela MINOR BLACK™ 'Verweig3' - 2-4 ft. tall x wide, mounded to compact. Leaves dark maroon to blackish-purple. Flower corolla deep pink. Bred by Bert Verhoef, bertverhoef.com, accessed 5.28.2015, intro. c. 2006.
--end of OROC Data Sharing

Your computer, tablet, phone, or book reader can have the latest cultivar encyclopedia for each genus in handy PDF form - the most complete cultivar references for more than 103 ornamental, landscape genera. CULTIVAR.ORG is a product of more than 35 years of work by leading horticultural taxonomist Larry Hatch and the hundreds of experts in the New Ornamentals Society and our experts partners around the world. We exceed your familiar plant manuals, horticultural society "complete" guides, and most websites by 3-20 times more cultivars and with much more specific, detailed data. For example, 159 Aucuba cultivars, 191 Astilbe, 274 Aquilegia, 109 Ajuga, 1032 Acer, 59 Abelia, 175 Aglaonema, and 103 Aesculus. Click logo above for more details.

If you prefer to purchase volumes separately our Google Play Books Store has many of the same files for $7.20 to $20.00 each. CULTIVAR.ORG is however about 60% less expensive since you are mass-purchasing access at the Preferred Library Rate.
Westringia Numerous new cultivar videos (Ozbreed)
Wisteria
Wisterias: A Comprehensive Guide by Valder (book, Amazon) - a superb study of the genus from many perspectives.

Wisteria.it by Fransceso Vignoni (special interest website, gallery) - a private, informative resource




WIST001 - Wisteria macrostachya SUMMER CASCADE™  'Betty Matthews' - 15-25 ft. tall, cascading mound, densely covered in flowers. Flower corolla deep lavender-blue with some paler portions. Proven cold hardy at the Minnesota Landscape Arboretum, USDA 4 or better. Firsteditionplants.com, accessed 4.14.2015, introduced c. 2012, first retail sales 2013
--end of OROC Data Sharing
Woodwardia
WOOD001 - Woodwardia unigemmata 'Ping Wu'

WOOD002 - Woodwardia orientalis 'Mamma Mia' (Plant Delights)
--end of OROC Data Sharing

Yucca


Benny's Yucca Page - highly recommended site on both wild and garden taxa from one of the leading collectors and scholars of this genus.  This site is a wonderful model of what a specialty web site can become and how it competes very well and usually exceeds all printed media on a genus.


YUCC001 - Yucca filamentosa 'Bronze Age' (Walters Gardens, new 2014)

YUCC002 - Yucca linearifolia 'Line Dance' (Plant Delights)
--end of OROC Data Sharing
Zantedeschia



Zandvoort Callas - a nice site from an originator of new material

Lakeside Callas - very useful images and data

Pacific Callas - a popular source of many clones


CHANNEL: Calla Lilies Flowers - numerous videos of individual cultivars
Zelkova Manual of Woody Landscape Plants by Dirr (book, Amazon) - very useful evaluations of cultivars, many quite new, from one of the top experts


ZELK001 - Zelkova serrata GOLD FALLS™ (Monrovia)
UNREGISTERED - Zelkova serrata 'Luminifera' (Esveld Nursery) - post-1959 Latin name, tbus illegitimate and invalid. A correction to 'Luminiferous' is suggested but we cannot yet identify the originator.
ZELK002 - Zelkova serrata DAVID'S WEEPABOUT« 'JSC Kingsthree'
ha: semi-pendulous, suggestive more of 'Green Veil' than a true, full blown weeper but distinct from
ha: that  clone in foliage.
lt: slightly twisted
ll, lm: more incised, very elongated, apex nearly filiform or thread-like
or: James Cavet, JSC Nursery
so: www.heritageseedlings.com, accessed 2014

ZELK003 - Zelkova serrata 'Green Mansions'
lc: margins white-flecked, an irregularly spotted margins (ie. margino-maculata style) as in
lc: 'Goshiki' but possibly a larger chimera than it. We have yet to compare both so it might be a rename.
in: www.heritageseedlings.com, accessed 2014
--end of OROC Data Sharing

27 cultivars + more botanical taxa
Zenobia 9 cultivars + more botanical taxa
Zephyranthes
NODgeo by Hatch (PDF ebook, New Ornamentals Society)


Zephranthes Hybrids -Pacific Bulb Society (gallery, plant society website)

Bulbsgarden.blospot.com

Rainlilies Gallery - Plant Delights by Avent (nursery catalog reference, gallery)

International Bulb Society (plant society website, gallery)

Rainlily, Zephyranthes and Habranthus: LowMaintenance Flower Bulbs for Florida Gardens by Knox (PDF article, University of Florida, IFAS)
Zingaber Zingaber mioga and its cultivars (RHS New Plantsman) - free article
Zinnia
ZINN01 - Z. grandiflora 'Raider Gold'

Swallow Tail Garden Seeds - 78 cultivars - (nursery website, gallery)

Rareseeds.com - numerous heirloom varieties
Copyright 2014, 2015 Laurence C. Hatch. All Rights Reserved.
GENERA P to Z : GENERA I - O : GENERA A to H