What is "gymnanthera"

Gymnanthera is a genus of vines in the family Apocynaceae (previously Asclepiadaceae), first described as a genus in 1810. It is native to China, Southeast Asia, and Australia.

1. Gymnanthera cunninghamii (Benth.) P.I.Forst. - Enderby Island + Dampier Archipelago of Western Australia
2. Gymnanthera oblonga (Burm.f.) P.S.Green - S China ( Guangdong, Hainan), Cambodia, Indonesia, Malaysia, New Guinea, Philippines, Thailand, Vietnam; Australia