| 1 | Leaves persistently velutinous or tomentose all over the undersurface, soft to the touch (cf. also 5. G. papuana). |
| 1' | Leaves covered with scattered hairs underneath, ± glabrescent with age, or glabrous from the beginning. |
| 2 | Nerves 2(-3) pairs. |
| 2' | Nerves 6-7(-8) pairs. |
| 3 | Ovary in ♀ flowers laxly to densely hairy. (Rudiment of ovary in ♂ flowers whether or not hairy). |
| 3' | Ovary (and rudiment of ovary in the ♂ flowers) glabrous or practically so. |
| 4 | Inflorescence conspicuously head-like, its branches (especially in the ♂ specimens) very short. |
| 4' | Inflorescence (especially in the ♂ specimens) generally more loose, its branches distinct and divergent |
| 5 | Leaves elliptic or oblong-, rarely ovate-elliptic, 12-20 by 4-8 cm, nerves 5-6(-7) pairs. Drupe (1.8-)2-2.4 by (0.6-)0.7-0.8 cm. |
| 5' | Leaves oblong, rarely ovate-lanceolate, 5-8(-9) by 1.5-3 cm, nerves 3-4(-5) pairs. Drupe 1-1.3 by 0.5-0.7 cm. |
| 6 | Petals hairy in their upper part, 5-7(-10) mm. Rudiment of ovary in the ♂ flowers hairy on top. Drupe 3.5-4 by c. 1.5 cm. |
| 6' | Petals glabrous or practically so, rarely up to 5 mm. Drupe much smaller. |
| 7 | Both ♂ and ♀ inflorescences many-flowered, cymes together on top of a peduncle, 1.5-2 cm (Rudiment of ovary in the ♂ flowers glabrous). Leaves coriaceous. |
| 7' | ♂ Inflorescences rather many-, ♀ ones few-flowered, cymes together on top of a generally rather short peduncle. Leaves chartaceous to coriaceous. |
| 8 | Leaves ± laxly covered underneath for a long time with appressed weak hairs, nerves 5-7 pairs. |
| 8' | Leaves practically glabrous from the beginning. (Rudiment of ovary in the ♂ flowers glabrous). |
| 9 | Rudiment of ovary in the ♂ flowers with a tuft of hairs on top. Very base of drupe not swollen. |
| 9' | Rudiment of ovary in the ♂ flowers glabrous or practically so. Base of drupe swollen to almost apophysate for c. 1 mm. |
| 10 | Leaves with (5-)6-8 pairs of nerves. Base of drupe not swollen. |
| 10' | Leaves with 8-10 pairs of nerves. Base of drupe distinctly swollen. |
| 11 | Filaments glabrous or practically so. |
| 11' | Filaments ventrally and/or dorsally hairy. |
| 12 | Filaments widened upwards and relatively short, i.e. c. 2 times as long as are the anther cells. |
| 12' | Filaments elongate-linear, at least 3 times as long as are the anther cells. |
| 13 | Filaments with short-clavate or papillose hairs, these never surpassing the anther cell. |
| 13' | Filaments with elongate-clavate ('glandular') or penicillate hairs (those from the connective often surpassing the anther cell). |
| 14 | Drupe (1.6-)1.8-2(-2.2) by 0.8-1 cm. |
| 14' | Drupe as far as known 1.3-1.6 by 0.5-0.6 cm. |
| 15 | Leaves practically glabrous. Calyx ± obconical, entire, glabrous. |
| 15' | Leaves ± densely short-pubescent all over the undersurface, especially at midrib and nerves. Calyx cup-shaped, dented, hairy. |
| 16 | Inflorescence very lax, peduncle and branches elongate, slender and rather few-flowered both in ♂ and ♀ specimens. |
| 16' | Inflorescence lax to dense, peduncle and branches relatively short at least in the ♂ specimens, generally many-, rarely few-flowered. |
| 17 | Petals ± densely appressedly hairy outside. |
| 17' | Petals sparsely hairy on top (in bud), or glabrous. |
| 18 | Drupe (2-)2.5-3(-4) cm long. |
| 18' | Drupe as far as known 1-2 (rarely -2.2) cm long. |
| 19 | Inflorescence rather compact, umbelliform. Drupe fusiform, 3.5-4 cm by 0.5-0.6 mm Ø. |
| 19' | Inflorescence rather lax. Drupe obovoid-oblongoid-ellipsoid, at least 0.8 cm ø. |
| 20 | Leaves narrow-lanceolate, chartaceous to subcoriaceous, nerves 3(-4) pairs. |
| 20' | Leaves (obovate-) elliptoc to oblong or lanceolate-oblong, ± coriaceous, nerves 4 or more pairs. |
| 21 | Leaves elliptic to obovate-elliptic. |
| 21' | Leaves elliptic- to lanceolate-oblong. |
| 22 | Inflorescence (at least in the g specimens) rather compact, ± umbelliform, on peduncle up to 5 mm. Leaves ± chartaceous, nerves (8-)10-12(-14) pairs. Very base of drupe swollen and smooth. |
| 22' | Inflorescence (at least in the ♂ specimens) with more laxly arranged and diverging branches, generally on peduncle longer than 5 mm. |
| 23 | Drupe ovoid- to oblong-ellipsoid, base generally swollen. Inflorescences (at least in the ♂ specimens) much-branched, generally many-flowered and distinctly scorpioid (i.e. flowers arranged on one side), rarely with fewer flowers and rather obscurely scorpioid then. |
| 23' | Drupe as far as known in mature state, oblongoid-ellipsoid, base broadly attenuate and not swollen. Inflorescences never scorpioid. |
| 24 | Leaves dark to blackish brown in dry state, and rufous- to rusty-tomentellous on midrib and nerves beneath, as are the branchlets. |
| 24' | Leaves green to greenish-brownish in dry state, and practically glabrous beneath, as are the branchlets. |
| 25 | Leaves brittle and blackish in dry specimens, nerves and veins ± obscure on both faces. Inflorescence with red-brown hairs. |
| 25' | Leaves greenish-brownish and generally not brittle in dry specimens, with a finely impressed reticulation above in fully mature state. |
