| 1 | Leaf blade 3-foliolate (or partly or all simple) |
| 1' | Leaf blade simple (unlobed or lobed) |
| 2 | Fruit c. 6.5 cm long. Fruiting pedicel 5-7 cm long; exocarp thick leathery. Seeds 9-10 by 4-4.5 mm. — Buru |
| 2' | Fruit 9-16(-20) cm long. Fruiting pedicel 1-3 cm long; exocarp woody. Seeds 20-27 by 11-15 mm. — Aru Islands |
| 3 | Plant (sub)annual; monoecious; diurnal. [Probract absent.] Male bracts 1(-2) mm long, mostly fugacious. Corolla 20(-30) mm diameter. Seeds compressed, pale, with coarsely undulate edge. [Fruit small, ovoid, or long-cylindrical in cultivated var. anguina.] |
| 3' | Plant (sub)perennial; monoecious or dioecious. [Probract present or absent.] Male bracts larger. Corolla c. 30 mm diam. or more. Seeds tumid or compressed, not with undulate edge |
| 4 | Plant with fruit (or female flowers). [Fruit not known in T. pulleana, Aru Islands.] |
| 4' | Plant with male flowers. [Male flowers not known in T. tricuspidata forma seramensis.] |
| 5 | Seeds tumid (barrel-shaped or (sub)fusiform) (Fig. 91b). [Probract absent.] |
| 5' | Seeds compressed |
| 6 | Fruit globose. Leaf blade ± 5-angular; with several small glands close to the insertion of the petiole. Seeds narrowly elliptic, chisel-shaped pointed at base |
| 6' | Fruit obovoid or ellipsoid |
| 7 | Fruit large, ± obovoid, 10-18 cm long; fruiting pedicel 10-20 mm thick. — Halmaheira |
| 7' | Fruit smaller; fruiting pedicel more slender |
| 8 | Leaf blade ± hastate (or 3-foliolate). Fruiting pedicel 5-7 cm long. — Buru |
| 8' | Leaf blade 3-lobed to halfway deep. Fruiting pedicel c. 2.5 cm long. — Seram |
| 9 | Bracts 10-30 mm long. [Sepals mostly with narrow lateral lobes. Leaf blade 5-angular, blackish on drying; with small glands close to the insertion of the petiole.] |
| 9' | Bracts either large (c. 20 mm long or more), incised (sometimes only shallowly so at apex), or bracts much smaller |
| 10 | Leaf blade deeply 5(-7)-lobed. Rachis of raceme 5-10 mm thick |
| 10' | Leaf blade unlobed or lobed. Rachis 1-3 mm thick |
| 11 | Leaf margin finely dentate. Bracts and flowers (inflorescence) densely brown short-hairy. — Aru Islands |
| 11' | Leaf margin entire. Bracts and flowers (sub)glabrous |
| 12 | Persistent part of pedicel 2 mm long or more |
| 12' | Persistent part of pedicel less than 2 mm long or absent (flowers from Moluccas not seen) |
