Lathyrus

Meikle, R.D. 1977: Flora of Cyprus 1Tutin, T.G., Heywood, V.H., Burges, N.A., Moore, D.M., Valentine, D.H., Walters, S.M. & Webb, D.A. 1968: Flora Europaea 2
but modified
1Leaves 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
2Lower leaves without leaflets, consisting of much-expanded petioles and stipules, resembling leaves
2'All the leaves with leaflets; stipules not leaf-like
3Corolla 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
4Pod (even when immature) with 2 distinct wings along the dorsal suture
4'Pod without wings along the dorsal suture
5Corolla blue or pinkish; pods glabrous; tendrils often branched
5'Corolla red or reddish; pods ciliate; tendrils generally simple
6Corolla at least 20 mm long
6'Corolla up to 20 mm long, usually much shorter
7Raceme 5-15-flowered; legume glabrous
7'Raceme 1-3-flowered; legume pubescent
8Leaves 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
9Pod 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
10Corolla 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
11Stipules 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
12Calyx 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
13Standard 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