1	"Old tendrils woody and ending in 2(-4) spinescent branches"	"Cissus furcifera"
1	"Tendrils, if present not woody and/or not ending in spinescent branches"	2
2	"Young stems green, succulent, 4-5-angled or 4-winged"	3
2	"Young stems not as above, older stems sometimes with corky wings"	5
3	"Stems 5-angled"	"Cissus quinqangularis"
3	"Stems 4-angled or 4-winged"	4
4	"Stems distinctly 4-winged, usually with crinkly edges to the wings; internodes 1.5-7 cm wide"	"Cissus cactiformis"
4	"Stems 4-angled; internodes up to 1.5 cm wide"	"Cissus quadrangularis"
5	"Leaves thick and fleshy"	"Cissus rotundifolia"
5	"Leaves neither thick nor fleshy"	6
6	"Young stems and leaves distinctly hairy; flowers produced before the leaves; petals puberulous"	"Cissus aphyllantha"
6	"Young stems and leaves glabrous or sparsely hairy; flowers usually produced with the leaves; petals glabrous"	7
7	"Leaves reniform, often more than 2.5 cm wide, tips broadly rounded; pedicels pubescent; old stems with corky ridges; stems with smooth or powdery whitish bark"	"Cissus ellenbeckii"
7	"Leaves ovate, up to 2.5 cm wide, tips usually acute; flowers usually produced before the leaves on glabrous pedicels; old stems without corky ridges, not whitish"	"Cissus aphylla"