| 1 | Inflorescence becoming paniculate by the successive development of branches below the umbellules. Fig. 19a |
| 1' | Inflorescence a compound umbel. |
| 2 | Inflorescence with four orders of branching. |
| 2' | Inflorescence with three (or fewer) degrees of branching. |
| 3 | Leaflets lanceolate. |
| 3' | Leaflets broader. |
| 4 | Leaflets c. 4-7 cm long. Fig. 20f |
| 4' | Leaflets much longer |
| 5 | Pedicels (at early anthesis) c. 10 mm long. |
| 5' | Pedicels (at early anthesis) c. 5 mm long, or shorter. |
| 6 | Peduncles of umbellules with bracts or their scars. Fig. 21a |
| 6' | Peduncles of umbellules without bracts or their scars. Fig. 21b |
| 7 | Leaves associated with the umbels rotund. Fig. 21e |
| 7' | Leaves (or leaflets) associated with the umbels ovate or elliptic. |
| 8 | Leaves associated with the umbels ovate, ± fleshy, with the lower surface smooth (lateral veins obscure). Fig. 21f |
| 8' | Leaves (or leaflets) associated with the umbels ± elliptic, coriaceous or chartaceous, veins visible. |
| 9 | Young parts glabrous |
| 9' | Young parts with rufous tomentum. |
| 10 | Umbels at anthesis with numerous filamentous pedicels. Fig. 21c. |
| 10' | Umbels at anthesis with fewer stout pedicels. Fig. 21d |
| 11 | Leaflets membranaceous or chartaceous. |
| 11' | Leaflets coriaceous. |
| 12 | Mid-leaflets c. 16 cm long |
| 12' | Mid-leaflets c. 8 cm long or shorter. |
| 13 | Leaflets usually 5-7 (Fig. 20a). Primary inflorescence branches usually short (c. 3-6 cm) and without articulations |
| 13' | Leaflets more numerous (Fig. 20d). Primary inflorescence branches longer (10-20 cm), with one or more leafy nodes |
| 14 | Leaflets c. 5 |
| 14' | Leaflets more numerous. |
| 15 | Petals and stamens 6 |
| 15' | Petals and stamens 4 or 5. |
| 16 | Leaflets 6 cm long, or longer. Fig. 20b |
| 16' | Leaflets shorter. Fig. 20c |
