''Decanema'' is a small genus in the

dogbane family Apocynaceae (from ''Apocynum'', Greek for "dog-away") is a family of flowering plants that includes trees, shrubs, herbs, stem succulents, and vines, commonly known as the dogbane family, because some taxa were used as dog poison Members of the ...

first described as a genus in 1838. The group is endemic to Madagascar.Liede, S. 1996. The Cynanchinae (Asclepiadaceae) in Madagascar: more new leafy and leafless species and subspecies. Bulletin du Muséum National d'Histoire Naturelle, Section B, Adansonia. Botanique Phytochimie 18: 103–135Descoings, B. 1961. Notes taxinomiques et descriptives sur quelques Asclépiadées Cynanchées (Asclépiadacées) aphylles de Madagascar. Adansonia, n.s. 1: 299–342 ;SpeciesThe Plant List, ''Decanema''
/ref> # '' Decanema bojerianum'' Decne. - Madagascar # '' Decanema luteifluens'' Jum. & H.Perrier - Madagascar ;formerly included *''Decanema grandiflorum'' Jum. & H.Perrier, synonym of '' Cynanchum grandidieri'' Liede & Meve.

References

Asclepiadoideae Apocynaceae genera Endemic flora of Madagascar Taxa named by Joseph Decaisne {{Apocynaceae-stub