What is "decanema"

Decanema is a small genus in the dogbane family first described as a genus in 1838. The group is endemic to Madagascar.

1. Decanema bojerianum Decne. - Madagascar
2. Decanema luteifluens Jum. & H.Perrier - Madagascar

• Decanema grandiflorum Jum. & H.Perrier, synonym of Cynanchum grandidieri Liede & Meve.