1	Floral torus diameter 2.5–4.5 mm. Capsule oblong to obovate to very broadly so or rotund in outline, capsule width (13–)18–32 mm	2
–	Floral torus diameter 1.7–2.5 mm. Capsule oblong to narrowly obovate in outline, capsule width 13–20(–22) mm	3
2	Leaves entire to moderately lobed at stem base and on vegetative stems but then less strongly lobed to entire on reproductive shoots, lobe margins at most weakly undulate	Dioscorea buchananii subsp. buchananii
–	Leaves consistently moderately to deeply 3, 5 or 7-lobed from stem bases to apices, with irregular, pinnate secondary lobing present on central lobe at least	Dioscorea buchananii subsp. undatiloba
3	Tepals erect, staminodia 3	Dioscorea rupicola
–	Tepals spreading, staminodia 6	Dioscorea multiloba