[=][=] Leaves pinnately 3-foliolate, rarely 1-foliolate.
27. Desmodium. Stamens diadelphous (9 and 1) or monadelphous below. Calyx 2-lipped. Pod several-jointed. Flowers all of one sort and complete. Leaflets stipellate.
28. Lespedeza. Stamens diadelphous (9 and 1); anthers uniform. Pod 1–2-jointed. Flowers often of 2 sorts, the more fertile ones apetalous. Leaflets not stipellate.
29. Stylosanthes. Stamens monadelphous; anthers of 2 sorts. Pod 1–2-jointed. Calyx deciduous, the tube narrow and stalk-like. Leaflets not stipellate.
[+][+][+][+] Herbs with abruptly pinnate leaves, terminated by a tendril or bristle; stamens diadelphous; pod continuous, 2-valved, few–several-seeded. (Vicieæ.)
30. Vicia. Wings adherent to the keel. Style filiform, bearded with a tuft or ring of hairs at the apex.
31. Lathyrus. Wings nearly free. Style somewhat dilated and flattened upwards, bearded down the inner face.
[+][+][+][+][+] Twining (sometimes only trailing) herbs, leaves pinnately 3- (rarely 1- or 5–7-) foliolate; no tendrils; peduncles or flowers axillary, pod not jointed, 2-valved. (Phaseoleæ.)
[=] Leaves pinnate.
32. Apios. Herbaceous twiner; leaflets 5–7. Keel slender and much incurved or coiled.