| 1 | Petals internally villous. Stipular thorns never present |
| 1' | Petals glabrous. Stipular thorns usually present |
| 2 | Leaves with l-2(-4) pairs of pinnae, each with (6-)12-25(-29) pairs of leaflets; leaflets 0.6- 1.6(-2.3) by 1.5-3.2(-5.5) mm |
| 2' | Leaves with (1—)3—4 pairs of pinnae, each with 6-15 pairs of leaflets; leaflets 2.5-8.3 by 1.4-4 mm |
