Cryptostegia

Cryptostegia is a genus of flowering plants native to tropical Africa and Madagascar. The genus is in the family Apocynaceae.

==Description== Cryptostegia includes three species of slender, many-stemmed, woody, perennial vines. When their stems or leaves are damaged they exude a milky latex that is extremely toxic to livestock; it contains cardiac glycosides that cause sudden death, especially after violent exertion. Though the latex is of good quality it is not used commercially.