Herbs, or rarely shrubs, often canescent with hairs affixed by the middle, with odd-pinnate leaves, small stipules, and pink or purple spicate or racemose flowers. Calyx-teeth oblique, nearly equal, or the lower longer. Standard ovate or orbicular, sessile or clawed; wings oblong; keel erect, somewhat gibbous, or spurred Stamens mainly monadelphous; anthers all alike. Ovary sessile or nearly so, 1-00-ovuled; style slender. Pod linear, 4-angled (in our species), septate between the seeds. [Name from the yield of indigo by some species.]

About 275 species. natives of warm and temperate regions. In addition to the following, some 7 others occur in the southern and southwestern United States. Type species: Indigofera tinctoria L.

20 Indig fera L Sp Pl 751 1753 862

1. Indigofera Leptosépala Nutt. Wild Or Western Indigo-Plant

Fig. 2520

Indigofera lettosepala Nutt.; T. & G. Fl. N. A. 1: 298. 1838.

Perennial decumbent, cinereous-pubescent, slender, branching, 6'-24' long. Leaves short-petioled; leaflets 5-9, oblanceolate or oblong-linear, 3"-12" long, 1-3" wide, obtuse and often mucron-ulate at the apex, narrowed or cuneate at the base, short-stalked; spikes peduncled, loosely few-flowered; flowers pink or purplish, about 3" long; calyx-teeth subulate, equal; pods linear, acute, obtusely 4-angled, sessile in the calyx, 8"-12" long, 1" thick, re-flexed at maturity.

Prairies, Kansas and Arkansas to Texas and Mexico, east to Florida. May-Nov.

21. CRÁCCA L. Sp. Pl. 752. 1753.

[Tephrosia Pers. Syn. 2: 328. 1807.]

Herbs, sometimes slightly shrubby, with odd-pinnate not punctate leaves, and purple red or white flowers in terminal or lateral racemes or short clusters. Stipules small. Leaflets entire. Calyx-teeth usually nearly equal. Petals all clawed. Standard orbicular or broadly ovate; wings obliquely obovate or oblong; keel curved. Stamens monadelphous or diadel-phous; anthers all alike. Ovary sessile; ovules several or many. Pod linear, flat, 2-valved, several-seeded, continuous, or with membranous septa between the seeds. [Latin, vetch.]

About 120 species, mainly natives of warm and tropical regions. Besides the following, eleven species occur in the southern and southwestern United States. Type species: Cracca villosa L.

Raceme terminal, dense, nearly sessile, many-flowered.

1.

C. virginiana.

Peduncles lateral and terminal, elongated, few-flowered.

Villous; flowers in an interrupted spike or raceme.

2.

C. spicata.

Pubescent; peduncles few-flowered near the summit.

3.

C. hispidula.