1	Leaves strongly discolorous, tertiary and quaternary veins prominent; flowers green, corona lobes triangular	V. kenouriense
–	Leaves weakly discolorous, tertiary and quaternary veins inconspicuous; flowers green or purple or bicolored, corona lobes not triangular	2
2	Flowers and leaves pendent, corolla tube pubescent internally	V. cardiostephanum
–	Flowers and leaves not pendent, corolla tube glabrous internally	3
3	Corolla lobes glabrous within	V. lenifolium
–	Corolla lobes hairy within	4
4	Corona lobes exceeding gynostegium in length	5
–	Corona lobes not exceeding gynostegium in length	8
5	Apices of corona lobes convergent; leaves hairy on both sides	6
–	Apices of corona lobes divergent; leaves not hairy on both sides	7
6	Plants densely pubescent; corona lobes ovate; follicles up to 6 cm long	V. luridum
–	Plants sparsely pubescent; corona lobes subulate; follicles up to 9.5 cm long	V. stocksii
7	Leaves narrowly to broadly ovate; corona lobes longer than broad; toothed	V. glaucum
–	Leaves lanceolate-ovate to elliptic-ovate; corona lobes rhomboid, broader than long	V. stewartianum
8	Leaves narrowly to broadly ovate, sub-canescent; corona lobes obovate	9
–	Leaves narrowly to mostly lanceolate-ovate; corona lobes not obovate	10
9	Leaves subsessile, corolla and inner floral parts purple	V. cabulicum
–	Leaves petiolate, corolla and inner floral parts green	V. subcanescens
10	Corona lobes rhomboid-deltoid	V. arnottianum
–	Corona lobes deltoid	V. sakesarense