38. Indigofera argutidens Craib, Notes Roy. Bot. Gard. Edinburgh. 8: 65. 1913.
尖齿木蓝 jian chi mu lan
Indigofera canocalyx Gagnepain; I. leptosepala Diels (1912), not Nuttall (1838).
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.
● Grasslands, thickets, Pinus forests; 2000-3000 m. NW Yunnan.