| 1 | Fruit calyx lobes shorter than nut |
| 1' | Fruit calyx lobes longer than nut, aliform. |
| 2 | Leaves usually longer than 14 cm; nerves distinctly unequal, prominent beneath, depressed above |
| 2' | Leaves shorter than 12 cm; nerves hardly raised beneath, subequal, not depressed above. |
| 3 | Fruit calyx lobes 10-12 mm broad. Calyx fused into a to 15 mm ø, over 5 mm deep, cup at base. |
| 3' | Fruit calyx lobes to 8 mm broad, narrow. Calyx fused into a cup at base not broader than 8 mm, not deeper than 3 mm. |
| 4 | Leaf lanceolate, revolute at base |
| 4' | Leaf broadly ovate, not revolute at base |
| 5 | Leaf 5-8 by 1.7-3 cm, glabrous. |
