1 | Leaves wholly wanting, stipules much enlarged, looking like simple, opposite leaves; corolla yellow |
1' | Leaves not wholly wanting, all or at least the upper with leaflets |
2 | Lower leaves without leaflets, consisting of much-expanded petioles and stipules, resembling leaves |
2' | All the leaves with leaflets; stipules not leaf-like |
3 | Corolla yellow or yellowish; dorsal suture of legume with 2 wings; lower leaves ovate-oblong |
3' | Corolla crimson with violet or lilac wings, very rarely pale yellow; dorsal suture of legume not winged; lower leaves linear-lanceolate |
4 | Pod (even when immature) with 2 distinct wings along the dorsal suture |
4' | Pod without wings along the dorsal suture |
5 | Corolla blue or pinkish; pods glabrous; tendrils often branched |
5' | Corolla red or reddish; pods ciliate; tendrils generally simple |
6 | Corolla at least 20 mm long |
6' | Corolla up to 20 mm long, usually much shorter |
7 | Raceme 5-15-flowered; legume glabrous |
7' | Raceme 1-3-flowered; legume pubescent |
8 | Leaves mostly 4-foliolate; leaflets generally truncate or emarginate; corolla very small, whitish, veined pale blue |
8' | Leaves mostly 2-foliolate; corolla conspicuous, yellow, pink or red |
9 | Pod narrowly linear (2.5-)3.5-7 x 0.4-0.6 cm; valves with numerous prominent longitudinal veins; corolla red |
9' | Pods oblong; valves without prominent longitudinal veins |
10 | Corolla small, usually less than 1 cm long, bright red; leaflets narrowly linear-lanceolate, grass-like; petiole often very short; peduncles and pedicels slender, capillary; seeds bluntly papillose-tuberculate |
10' | Corolla rather large, more than 1 cm long; leaflets not grass-like; petiole usually well developed; peduncles not capillary |
11 | Stipules very narrow, the lobes subulate or filiform; racemes 1-3-flowered; seeds with a tuberculate or rugose testa |
11' | Stipules generally rather broad, semi-sagittate or semi-hastate, usually 2-5(-8) mm wide; racemes always 1-flowered; seeds with a smooth, rarely very obscurely tuberculate testa |
12 | Calyx eglandular externally; petals yellow or yellowish veined red; testa closely and strongly tuberculate |
12' | Calyx dotted over externally with sessile glands; corolla pink; testa with scattered blunt tubercles, the intervening spaces minutely scabridulous |
13 | Standard generally less than 15 mm long, orange or reddish or salmon-pink; limb of wings 10-11 x 4-5 mm; calyx-teeth usually adpressed to petals at anthesis, deltoid or lanceolate |
13' | Standard generally more than 15 mm long, yellow or pale orange; limb of wings c. 13 x 4-5 mm; calyx-teeth often patent or reflexed at anthesis, deltoid-subulate |