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| 1 | Petals 5, subequal, united into a tube at base; stamens 5; fruit a subspherical berry | Carpolobia |
| 1 | Petals 3 (or minute or 0); stamens (4-)7-8; fruit a samara or capsule | 2 |
| 2 | Petals free; fruit an indehiscent samara | Securidaca |
| 2 | Petals united, the two upper joined to the keel; fruit a capsule | 3 |
| 3 | Keel-appendage 2-lobed, expanded and leaflike; flowers solitary (in ours); stamens 7 | Muraltia |
| 3 | Keel-appendage (crest) fimbriate or at least many-lobed; flowers in racemes (sometimes solitary in P. erioptera); stamens 8 (or 6 fertile and 2 sterile) | Polygala |
| Home | > | List of families | > | Polygalaceae | > | Key to genera |