1	"Plants small shrubs, sometimes with twining younger branches"	2
1	"Plants herbs or subshrubs, climbing, scrambling, or decumbent"	4
2	"Corona lobes about 0.75 mm long, flattened; pollinia pendent; leaves mostly more than 5 mm wide"	"Vincetoxicum fruticulosum"
2	"Corona lobes 0.3-0.4 mm long, strongly swollen towards the base; pollinia spreading to suberet; leaves usually well over 5 mm wie"	3
3	"Flower buds conical; corolla lobes 9-10 mm long; corona lobes biseriate, the basal portioin forming a reflexed tongu, the upper section pouched"	"Vincetoxicum arachnoidea"
3	"Flower buds globose; corolla lobes about 2.5 mm long; corona lobes uniseriate, minute, fleshy"	"Vincetoxicum fleckii"
4	"Corolla tubes much longer than the erect lobes"	"Vincetoxicum somaliense"
4	"Corolla tubes much shorter than the, usually, spreading lobes"	"Vincetoxicum cernuum"