| 1 | Flowers small (1.5-2 cm diam.), in branched panicles; sepals creamy or greenish-white; leaflets 6-10 cm long; deciduous shrub |
| 1' | Flowers large (4-8 cm diam.), solitary; sepals yellow or violet-purple; leaflets 1.5-5 cm long; evergreen shrub |
| 2 | Sepals violet or violet-purple; involucre absent; achenes without a plume |
| 2' | Sepals pale yellow; peduncle terminating in a cup-like involucre; achenes plumose |
