* Caladium (all parts)
* Castor Bean (seed, leaves)
* Christmas Rose (root, leaves, sap)
* Diffenbachia (all parts)
* Philodendron (all parts)
* Mistletoe (berries)
* Rosary Pea (seeds)
* Autumn Crocus (all, esp. bulb)
* Bleeding Heart (leaves, roots)
* Dutchman's Breeches (leaves, roots)
* Foxglove (leaves)
* Larkpsur (all; seeds)
* Lily of the Valley (all)
* Monkshood (all)
* Narcissus (all)
* Daffodil (all)
* Jonquil (all)
* Potatoes (all green parts)
* Rhubarb (leaves)
* Tomato (leaves)
* Apple (large amount of seeds)
* Apricot (seed)
* Almond (seed)
* Avocado (leaves)
* Azalea (all)
* Black Locust (bark, twigs, seeds)
* Boxwood (leaves, twigs)
* Buckeye (leaves, nuts, flowers, sprouts)
* Horsechestnut (same)
* Chinaberry (furit, bark, berries)
* Chokecherry (leaves, seeds, bark)
* Wild Black Cherry (same)
* English Holly (berries)
* Oaks (tannins in foliage and acorns)
* Oleander (all including dried leaves)
* Privet (leaves, berries)
* Rhododendron (all parts)
* Yew (all, esp. berries)
* Daphne (all; fruit)
* English Ivy (berries, leaves)
* Golden Chain (seeds, pods, flowers)
* Lantana (green berries, leaves)
* Mountain Laurel (all even honey from flowers is toxic)
* Yellow Jasmine (all, including nectar and roots)
* Wisteria (pods, seeds)
* Buttercup (all)
* Cone Flower (all)
* Black-eyed Susan (all)
* Hemlock (seeds, stems, fleshy taproot
often mistaken for wild parsnip or anise)
* Jack-in-the-pulpit (all)
* Jumson Weed (all--very dangerous drug too often used by teens)
* Amanita Mushrooms (all)
* Nightshade (all)
* American Bittersweet (berries, roots, leaves)
* Deadly Nightshade (all)
* Pokeweed (roots, shoots, leaves)
* White Snakeroot (all parts)
* Morning Glory (seeds)
* Tobacco (leaves)
* Tulip (bulbs)
* Iris (corms)
This is not a complete list but covers most of the worst ones.
Note that poinsettia is not considered toxic.
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