9. Trifolium. Flowers capitate. Pods membranaceous, 1--6-seeded. Petals adherent to the stamen-tube. 10. Melilotus. Flowers racemed. Pod coriaceous, wrinkled, 1--2-seeded. 11. Medicago. Flowers racemed or spiked. Pods curved or coiled, 1--few-seeded. [+][+] Leaves unequally pinnate (or digitate in n. 13); pod not jointed; not twining nor climbing (except n. 20). [++] Flowers umbellate (solitary in ours) on axillary peduncles. (LOTEÆ.) 12. Hosaekia. Leaves 1--3-foliolate. Peduncle leafy-bracteate. Pod linear. [++][++] Flowers in spikes, racemes, or heads. (GALEGEÆ.) [=] Herbage glandular-dotted; stamens mostly monadelphous; pod small, indehiscent, mostly 1-seeded; leaves pinnate (except in n. 13). 13. Psoralea. Corolla truly papilionaceous. Stamens 10, half of the anthers often smaller or less perfect. Leaves mostly palmately 3--5-foliolate. 14. Amorpha. Corolla of one petal! Stamens 10, monadelphous at base. 15. Dalea. Corolla imperfectly papilionaceous. Stamens 9 or 10; the cleft tube of filaments bearing 4 of the petals about its middle. 16. Petalostemon. Corolla scarcely at all papilionaceous. Stamens 5; the cleft tube of filaments bearing 4 of the petals on its summit. [=][=] Herbage not glandular-dotted (except in n. 23); stamens mostly diadelphous; pod 2-valved, several-seeded; leaves pinnately several-foliolate; flowers racemose. [a.] Wings cohering with the keel; pod flat or 4-angled; hoary perennial herbs. 17. Tephrosia. Standard broad. Pod flat. Leaflets pinnately veined. 18. Indigofera. Calyx and standard small. Pod 4-angled. Leaflets obscurely veined. [b.] Flowers large and showy; standard broad; wings free; woody; leaflets stipellate. 19. Robinia. Pod flat, thin, margined on one edge. Trees or shrubs. 20. Wistaria. Pod tumid, marginless. Woody twiners; leaflets obscurely stipellate. [c.] Standard narrow, erect; pod turgid or inflated; perennial herbs. 21. Astragalus. Keel not tipped with a point or sharp appendage. Pod with one or both the sutures turned in, sometimes dividing the cell lengthwise into two. 22. Oxytropis. Keel tipped with an erect point; otherwise as Astragalus. 23. Glycyrrhiza. Flowers, etc., of Astragalus. Anther-cells confluent. Pod prickly or muricate, short, nearly indehiscent. [+][+][+] Herbs with pinnate or pinnately 1--3-foliolate leaves; no tendrils; pod transversely 2--several-jointed, the reticulated 1-seeded joints indehiscent, or sometimes reduced to one such joint. (HEDYSAREÆ.) [=] Leaves pinnate, with several leaflets, not stipellate. 24. Æschynomene. Stamens equally diadelphous (5 and 5). Calyx 2-lipped. Pod several-jointed; joints square. 25. Coronilla. Stamens unequally diadelphous (9 and 1). Calyx 5-toothed. Joints oblong, 4-angled. Flowers umbellate. 26. Hedysarum. Stamens unequally diadelphous (9 and 1). Calyx 5-cleft. Pod several-jointed; joints roundish. [=][=] Leaves pinnately 3-foliolate, rarely 1-foliolate.