Decanema is a small genus in the dogbane family first described as a genus in 1838.Decaisne, Joseph. 1838. Annales des Sciences Naturelles; Botanique, sér. 2 9: 338, t. 12GTropicos, Decanema Decne. 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 Decanema bojerianum Decne. - Madagascar Decanema luteifluens Jum. & H.Perrier - Madagascar
formerly included Decanema grandiflorum Jum. & H.Perrier, synonym of Cynanchum grandidieri Liede & Meve.
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