Indigofera argutidens Craib

Shrubs or shrublets, 30-80 cm tall, many branched. Stems terete toward base, angular when young, with dense spreading long stiff brown trichomes and some short and submedifixed 2-branched trichomes. Stipules linear, 8-10 mm, persistent, with dense long spreading white or brown stiff trichomes. Leaves 3.5-8 cm, 7-13(or 15)-foliolate; petiole and rachis with dense spreading long stiff brown trichomes; petiole 3-5 mm; rachis adaxially grooved; stipels absent; petiolules ca. 1 mm; leaflet blades opposite, elliptic, oblong, obovate, or obovate-oblong, 0.7-2(-2.5) × 0.4-0.9(-1.3) cm, papery, both surfaces with sparse ± spreading white or gray and long basifixed to sub­basifixed trichomes, abaxially with long stiff brown basifixed trichomes along midvein, midvein adaxially obviously de­pressed, secondary veins not visible, base cuneate to rounded, apex obtuse to emarginate and with a 1.5-3 mm mucro. Ra­cemes ca. 3.5 cm; peduncle and rachis with dense spreading long stiff white trichomes; peduncle ca. 1.2 cm; bracts linear, 7-8 mm, abaxially with long white trichomes. Pedicel 2-2.5 mm but to 4 mm in fruit, with long stiff white trichomes. Calyx ca. 5 mm, outside with long stiff spreading white trichomes; tube ca. 1.5 mm; teeth narrowly triangular, 2-3(-4) mm. Corolla pur­plish red; standard broadly elliptic, 9-11 × ca. 5 mm, outside with spreading white long soft trichomes; wings ca. 9 mm, base auriculate, margin ciliate; keel 0.9-1.1 cm, outside apically hairy, margin ciliate, spur minute. Stamens 9-10 mm; anthers ovoid-globose, glabrous or base very sparsely hairy. Ovary gla­brous, with more than 10 ovules. Legume cylindric, 2-3 cm, glabrescent; endocarp blotched. Seeds 8 or 9 per legume. Fl. May-Jul, fr. Sep.