| | 1. Sepals and petals 4; leaf entire |
| R. luteola |
| | 1' Sepals and petals 5–6; leaf entire or lobed |
| |
| | 2. Leaf pinnately lobed, lobes 4–11 per side; petals alike, ± equally 3-lobed; fruit 4-parted, with persistent filaments |
| R. alba |
| | 2' Leaf entire or ternately or pinnately lobed, lobes 0–3 per side; petals unlike, entire to unequally 6-lobed; fruit 3-parted, without persistent filaments |
| |
| | 3. Leaf entire to ternately lobed, lobe 0–1 per side; bracts persistent in fruit; pedicel 4–12 mm; stamens 20–25; seed rough, 2–2.2 mm |
| R. odorata |
| | 3' Leaf pinnately lobed, lobes 1–3 per side; bracts not persistent in fruit; pedicel 2–4.5 mm; stamens 14–17; seed smooth, 1.5–1.7 mm |
| R. lutea
|