R. D. Meikle, Flora of Cyprus 1. 1977
but modified
1Plants spinose; leaves paripinnate, the rhachis produced into a rigid spine; flowers in small axillary clusters
1'Plants unarmed; leaves imparipinnate
2Leaves all basal or sub-basal in tufts or rosettes; stems scarcely developed
2'Leaves not all basal or sub-basal; stems well developed
3Inflorescences 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
4Flowers conspicuous; standard 15-30 mm long
4'Flowers inconspicuous; standard less than 15 mm long
5Inflorescences 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
6Pods narrowly oblong, dorsiventrally flattened with coarsely serrate margins
6'Pods not as above, margins not serrate
7Pods cordate-triangular, dorsiventrally compressed; flowers minute
7'Pods not cordate-triangular, nor dorsiventrally compressed
8Pods strongly hamate (sickle-shaped)
8'Pods straight or slightly curved
9Pods 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
10Pods hirsute with long spreading hairs
10'Pods shortly adpressed-strigose