2. T. spicàta, Torr. & Gray. _Villous with rusty hairs_; stems branched below, straggling or ascending (2° long), _few-leaved_; leaflets 9--15, obovate or oblong-wedge-shaped, often notched; _flowers few_, in a loose and interrupted _very long-peduncled spike_, reddish.--Dry soil, from Del. and Va. to Fla. and Miss. July. 3. T. hispídula, Pers. Hairy with some long and rusty or only minute and appressed pubescence; stems slender (9--24´ long), divergently branched, straggling; leaflets 5--15, oblong, varying to obovate-wedge-shaped and oblanceolate; _peduncles longer than the leaves, 2--4-flowered_, flowers reddish-purple.--Dry sandy soil, Va. to Fla. and Ala. 18. INDIGÒFERA, L. INDIGO. Calyx small, equally 5-cleft. Standard roundish, silky outside, wings coherent; keel erect, gibbous or spurred at base. Stamens diadelphous; connective gland-like. Pod 1--several-seeded, septate within between the seeds.--Herbs or shrubs, mostly canescent with appressed hairs fixed by the middle, with odd-pinnate faintly-nerved leaves, and pink or purplish flowers in naked axillary spikes. (So named because some of the species yield the indigo of commerce.) 1. I. leptosépala, Nutt. A perennial herb, ½--2° high; leaflets 5--9, oblanceolate; spikes very loose; pods linear, 6--9 seeded, obtusely 4-angled, reflexed, 1´ long.--Kan. to Tex. and Fla. 19. ROBÍNIA, L. LOCUST-TREE. Calyx short, 5-toothed, slightly 2-lipped. Standard large and rounded, turned back, scarcely longer than the wings and keel. Stamens diadelphous. Pod linear, flat, several-seeded, margined on the seed-bearing edge, at length 2-valved.--Trees or shrubs, often with prickly spines for stipules. Leaves odd-pinnate, the ovate or oblong leaflets stipellate. Flowers showy, in hanging axillary racemes. Base of the leaf-stalks covering the buds of the next year. (Named in honor of _John Robin_, herbalist to Henry IV. of France, and his son _Vespasian Robin_, who first cultivated the Locust-tree in Europe.) 1. R. Pseudacàcia, L. (COMMON LOCUST or FALSE ACACIA.) Branches naked; _racemes slender, loose_; flowers white, fragrant; pod smooth.--S. Penn. to Ind., Iowa, and southward. Commonly cultivated as an ornamental tree, and for its valuable timber; naturalized in many places. June. 2. R. viscòsa, Vent. (CLAMMY L.) _Branchlets and leaf-stalks clammy; flowers crowded in oblong racemes_, tinged with rose-color, nearly inodorous; pod glandular-hispid.--Va. to N. C. and Ga., in the mountains. Cultivated, like the last, and often escaped. June. 3. R. híspida, L. (BRISTLY L. or ROSE ACACIA.) Shrub 3--8° high; _branchlets and stalks bristly_; flowers large and deep rose-color, inodorous; pods glandular-hispid.--Varies with less bristly or nearly naked branchlets; also with smaller flowers, etc.--Mts. of Va. to N. C. and Ga. May, June. 20. WISTÀRIA, Nutt.