Decanema is a small genus in the dogbane family first described as a genus in 1838. The group is endemic to Madagascar.
Species
- Decanema bojerianum <small>Decne.</small> - Madagascar
- Decanema luteifluens <small>Jum. & H.Perrier</small> - Madagascar
formerly included
- Decanema grandiflorum <small>Jum. & H.Perrier,</small> synonym of Cynanchum grandidieri <small>Liede & Meve.</small>
References