| 1 | Bark obnoxiously pungent. Leaflets serrate or dentate. Petal margins, ovary and disk glabrous. Capsule columellas convex without apical scarring. Seeds winged at one end |
| 1' | Bark sweetly aromatic. Leaflets entire. Petal margins ciliate; ovary and disk pilose. Capsule columellas concave with apical scarring. Seeds winged at both ends |
| 2 | Leaflets usually conspicuously pilose on upper midribs. Flower bud petals usually with dense central ciliate bands externally; styles pilose. Capsule valves usually verrucose with conspicuous rusty lenticels |
| 2' | Leaflets usually glabrescent on upper midribs. Flower bud petals glabrescent to sparsely pilose externally; styles glabrous. Capsule valves usually smooth to minutely lenticellate with small inconspicuous lenticels |
