| 1 | Leaf blade 3(-5)-foliolate (or partly unlobed ?) |
| 1' | Leaf blade simple (unlobed or lobed) |
| 2 | Plant (sub)annual; monoecious; diurnal. Male bracts 1(-2) mm long, mostly caducous. Corolla 20(-30) mm diameter. [Fruit small, ovoid, or long-cylindrical in cultivated var. anguina.] Seeds compressed, pale, with coarsely undulate edge |
| 2' | Plant (sub)perennial. Corolla c. 30 mm diam. or more. Seeds tumid or compressed, edge not undulate |
| 3 | Whole plant densely (grey-)brown villose |
| 3' | Plant thinly hairy or glabrous (glabrescent) |
| 4 | Plant with fruit (or female flowers) |
| 4' | Plant with male flowers |
| 5 | Fruit globose. Seeds narrowly elliptic, chisel-shaped pointed at base. [Leaf blade ± 5-angular, blackish on drying; with several small glands close to the insertion of the petiole.] (Not yet recorded for Lesser Sunda Islands.) |
| 5' | Fruit ovoid(-ellipsoid). Seeds tumid or compressed, not pointed. [Leaf blade unlobed or (deeply) lobed.] |
| 6 | Seeds tumid (barrel-shaped or (sub)fusiform) (Fig. 91b). Leaf blade (sub)glabrous or hairy, at least on smaller veins beneath |
| 6' | Seeds compressed, (narrowly) ovate, rounded at both ends. Leaf blade glabrous |
| 7 | Fruit large, 10 cm long or more. Leaves not scabrid |
| 7' | Fruit smaller. Leaf blade scabrid |
| 8 | Leaf blade glabrous, ± 5-angular [blackish on drying, with several small glands near the insertion of the petiole.] Bracts c. 20 mm long, entire. Sepals with narrow sidelobes |
| 8' | Leaf blade glabrous, hairy, or scabrous, unlobed or (deeply) lobed. Bracts (coarsely) indented, or much smaller, (sub)entire. Sepals (mostly) entire |
| 9 | Leaf blade subglabrous or hairy, at least on smaller veins beneath, not scabrous. Bracts 15 mm long or less, coarsely dentate or entire, without glands |
| 9' | Leaf blade scabrous. Bracts c. 20 mm long, deeply indented, with glands |
