What is "pentasachme"

Pentasachme is a species of plants in the Apocynaceae first described as a genus in 1834. It contains only one recognized species, Pentasachme caudatum, native to southern China, the Indian Subcontinent, and Southeast Asia.

formerly included

moved to other genera ( Cynanchum, Heterostemma)

1. P. brachyantha now Cynanchum stauntonii
2. P. esquirolii now Heterostemma esquirolii
3. P. glaucescens now Cynanchum glaucescens
4. P. stauntonii now Cynanchum stauntonii

species of uncertain affinities

1. Pentasachme fasciculatum (Buch.-Ham. ex Wight) M.R.Almeida - India
2. Pentasachme pulcherrima Grierson & D.G. Long - Bhutan, Nepal
3. Pentasachme shanense MacGregor & W. W. Smith - Myanmar
4. Pentasachme wallichii Wight - Himalayas