| 1 | Inflorescence or flower distinctly pedunculate |
| 1' | Inflorescence or flower sessile or subsessile |
| 2 | Corolla pink or pink and white, peduncle exaristate; flower and fruit strongly reflexed |
| 2' | Corolla yellow, yellowish or creamy-white |
| 3 | Shrubby perennials |
| 3' | Herbaceous annuals |
| 4 | Pod torulose |
| 4' | Pod not torulose |
| 5 | Peduncle exaristate, or arista very short; pods ovoid or ellipsoid |
| 5' | Peduncle distinctly aristate; pods oblong |
| 6 | Pod 20-25 mm long, 5-7 mm. wide; corolla distinctly longer than calyx; flowers frequently in pairs |
| 6' | Pod 8-17 mm long, 3-4 mm wide; corolla equalling or shorter than calyx; flowers usually solitary |
| 7 | Keel sharply upcurved to a beak as long as or longer than the basal part; peduncle clothed with long spreading hairs; plant 15-40 cm high |
| 7' | Keel upcurved to a beak shorter than the basal part; peduncle shortly glandular-pubescent; plant 7-15(-30) cm high |
| 8 | Corolla yellow or yellowish |
| 8' | Corolla pink or pink and white |
| 9 | Leaves 3-foliolate; subshrubby perennial |
| 9' | Leaves 1-foliolate; maritime annual |
| 10 | Subshrubby spinescent perennials |
| 10' | Herbaceous annuals |
| 11 | Cauline leaves 1-foliolate; calyx with long spreading hairs |
| 11' | Cauline leaves 3-foliolate; calyx shortly glandular-pubescent or subglabrous |
| 12 | Standard glabrous externally; stipules of floral leaves whitish and conspicuous |
| 12' | Standard glandular or hairy externally; stipules of floral leaves not whitish or conspicuous |
| 13 | Inflorescence a slender, rather lax spike; standard oblong-obovate, 4-5 mm wide; leaflets with 10-20 conspicuous spreading teeth |
| 13' | Inflorescence a dense oblong spike; standard obovate-orbicular, 6-7 mm wide; leaflets with 12-24(-30) small teeth |
