1 | Plants spinose; leaves paripinnate, the rhachis produced into a rigid spine; flowers in small axillary clusters |
1' | Plants unarmed; leaves imparipinnate |
2 | Leaves all basal or sub-basal in tufts or rosettes; stems scarcely developed |
2' | Leaves not all basal or sub-basal; stems well developed |
3 | Inflorescences long-pedunculate; leaflets silvery with adpressed hairs; pods narrowly cylindrical; petals pinkish or yellowish |
3' | Inflorescences sessile or indistinctly pedunculate; leaflets villose with long spreading hairs; pods oblong, somewhat inflated; petals greenish-yellow turning reddish with age |
4 | Flowers conspicuous; standard 15-30 mm long |
4' | Flowers inconspicuous; standard less than 15 mm long |
5 | Inflorescences subsessile or very shortly pedunculate; petals bright yellow; pods large, inflated, with a corky or spongy pericarp, 15-20 mm wide |
5' | Inflorescences distinctly pedunculate; petals creamy-white or purplish; pod without corky or spongy pericarp, 8-13 mm wide |
6 | Pods narrowly oblong, dorsiventrally flattened with coarsely serrate margins |
6' | Pods not as above, margins not serrate |
7 | Pods cordate-triangular, dorsiventrally compressed; flowers minute |
7' | Pods not cordate-triangular, nor dorsiventrally compressed |
8 | Pods strongly hamate (sickle-shaped) |
8' | Pods straight or slightly curved |
9 | Pods triangular in transverse section, not radiating stellately, stiffly chartaceous, somewhat inflated |
9' | Pods not triangular in transverse section, generally radiating stellately from a central point of attachement |
10 | Pods shortly adpressed-strigose |
10' | Pods hirsute with at least some spreading hairs |
11 | Leaves sessile; stem with ascending hairs; indumentum with white hairs only (rarely blackish hairs on the calyx teeth) |
11' | Leaves with 0.5-1.5 cm long petioles; stem mostly with patent, rarely subadpressed hairs; indumentum with whitish and blackish hairs |