All parts of this plant are toxic, especially the root, which is a severe skin irritant. Bryony contains the glycosides bryonin and bryondin which could affect the gastrointestinal tract, cause diarrhoea, convulsions, paralysis and death. Not one to have near the tortoise enclosure.
The flower colours are usually described as green, but they are more of a greenish-white.
Bryony is sometimes called the English Mandrake, but it should not be confused with the true Mandrake (Mandragora spp.). It should also not be confused with Black Bryony (Tamus communis), which is also a climber and is toxic.