Karthikeyan et al. (2009) have listed following species of Pentasachme in India:
Pentasachme (Apocynaceae) page with images of species in efloraofindia : 1 post by 1 author
If you find any mis-identification, pl. let us know. If anybody can send images of other species of this genera (for incorporation in the website), if any, it will be really nice.