腺毛木蓝 xian mao mu lan

Indigofera scabrida f. alba H. F. Comber; I. smithiana E. Peter.

Shrubs, erect, 50-80 cm tall. Stems terete, with dense rusty brown gland-tipped trichomes and spreading minute basifixed extremely asymmetrically 2-branched trichomes. Stipules nar­rowly lanceolate to narrowly triangular, with long rusty brown gland-tipped trichomes. Leaves 9-13 cm, 7-13-foliolate; peti­ole and rachis with rusty brown gland-tipped trichomes and mi­nutely basifixed trichomes; petiole 1.5-1.8 cm; stipels subulate, 1-2 mm; petiolules 1.5-2.5 mm; leaflet blades opposite, elliptic to elliptic-oblong, 1.5-3 × 0.7-2 cm, abaxially with sparse ap­pressed basifixed trichomes or medifixed trichomes, adaxially glabrescent or with ± spreading basifixed trichomes or ap­pressed medifixed trichomes, midvein and margin with sparse rusty brown gland-tipped trichomes, midvein abaxially promi­nent and adaxially impressed, secondary veins 6-8 on each side of midvein, base rounded, apex obtuse and with a ca. 0.5 mm mucro. Racemes 16-18 cm, many flowered; peduncle 1-2 cm; bracts linear-triangular, 2-3 mm, caducous, margin with rusty brown gland-tipped trichomes. Peduncles and pedicels with rusty brown gland-tipped trichomes and spreading minutely basifixed to medifixed trichomes as on branches. Pedicel ca. 1 mm but to 2-3 mm and spreading in fruit. Calyx 2-2.5(-3) mm, with appressed white basifixed or medifixed trichomes and rusty brown gland-tipped trichomes; tube 0.5-1 mm; teeth line­ar, 1-2 mm, apex acuminate. Corolla crimson; standard ovate to obovate, ca. 7 × 4 mm, outside puberulent, apex obtuse and with a short mucro; wings ca. 6 mm, margin ciliate; keel ca. 7 mm, outside puberulent, margin ciliate. Stamens (5.5-)6-7 mm; anthers ovoid-ellipsoid, glabrous. Ovary linear, ca. 5 mm, gla­brescent or sparsely hairy along sutures; style ca. 2 mm. Leg­ume subcylindric, straight, 2.8-4 cm × 2.5-4 mm, with very sparse minute appressed trichomes, sutures thin. Seeds 8-12 per legume, glossy dark brown, smooth, ca. 2 × 1 mm, both ends truncate. Fl. Jun-Sep, fr. Aug-Oct.

Sparse forests, Pinus forests, thickets; 1400-2100 m. Guizhou, Sichuan, Yunnan [Laos, Myanmar].

We have not seen the type of Indigofera smithiana (H. Smith 1695).