Acanthostemma
Amblyostemma
Ancistrostemma
Cyrtoceras
Eriostemma
Eu-Hoya
Kloiphora
Otostemma
Physostelma
Plocostemma
Pterostelma
Rudimetalia
Skenostemma

(IPNI) International Plant Name Index
Kloppenburg, Hoya sections, a complete study<