| 1 | Adult leaves pinnate |
| 1' | Adult leaves entire, simple or pinnatifid, never pinnate; fruit indehiscent |
| 2 | Fruit indehiscent, seeds not winged; style recurved |
| 2' | Fruit a follicle, seeds winged; style erect |
| 3 | Fruit indehiscent with thick hard or fleshy pericarp, seeds not winged |
| 3' | Fruit a dehiscent follicle, pericarp thin not fleshy, seeds winged |
