Selenicereus grandiflorus
With this animation you'll determine the difference between the two genus. I guess this could be the Selenicereus grandiflora, at least the petals are yellow. Remarqueable is this flower opens immediately. I could smell the parfum since midnight.
I wish to obtain the exact name of this genus. Further I'am interested in links pointing to other images or descriptions of this and other Selenicereus.
How this genus is cultivated click here

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the author : jef.keymeulen@online.be