1	"Stems and corolla variously rough-hairy; flowers distinctly foul-smelling"	Stapelia
1	"Stems and corolla hairless; flowers not noticeably foul-smelling"	2
2	"Interstaminal corona stalkless or fused to the base of the corolla"	Huernia
2	"Interstaminal corona either stalked or not fused to the base of the corolla"	Orbea