| 1 | Leaves ± deeply bilobed; fertile stamens 0-10 |
| 1' | Leaves entire, fertile stamens 10 |
| 2 | Fertile stamen 1 |
| 2' | Fertile stamens more than 1 |
| 3 | Fertile stamens 3-5 |
| 3' | Fertile stamens 10 or absent in female flowers |
| 4 | Fertile stamens 3 |
| 4' | Fertile stamens 5 |
| 5 | Buds ridged; hypanthium 7-12 mm, flowers pink to purple.. |
| 5' | Buds smooth, rarely ridged; hypanthium 10-40 mm, flowers white or orange to red |
| 6 | Leaves up to 5 cm diam.; petals crimson red; cultivated |
| 6' | Leaves more than 9 cm diam.; petals white or red with yellow centre. |
| 7 | Buds pointed with 5 free, subulate tips; flowers white |
| 7' | Buds without 5 free, subulate tips; flowers yellow or greenish-white |
| 8 | Buds glabrous or nearly so; pods with sharply raised parallel ridges along the suture; leaf lobes with acute tip |
| 8' | Buds hirsute; pods without raised sutures; leaf-lobes with blunt tip. |
| 9 | Buds longer than 15 mm; flowers bright yellow |
| 9' | Buds up to 10 mm; flowers greenish-white |
| 10 | Leaves ovate; base cordate to truncate; sepals densely pubescent |
| 10' | Leaves lanceolate-acuminate; base rounded or shallowly cordate; sepals sparsely pubescent |
