What is "raphistemma"

Raphistemma is a genus of flowering plants of the family Apocynaceae, first described as a genus in 1831. It is native to China and Southeast Asia.

1. Raphistemma hooperianum (Blume) Decne. - Guangxi, Thailand, Vietnam
2. Raphistemma pulchellum (Roxb.) Wall. - Guangxi, Thailand, India, Laos, Peninsular Malaysia, Myanmar, Nepal, Sikkim