58. Indigofera silvestrii Pampanini, Nuovo Giorn. Bot. Ital., n.s. 17: 397. 1910.
刺序木蓝 ci xu mu lan
Indigofera bungeana Walpers var. nana L. C. Wang & X. G. Sun; I. bungeana f. spinescens Kobuski.
Shrubs, 0.6-1.5 m tall, many branched. Stems brown, terete; young branches yellowish green, glabrous. Stipules ca. 1 mm. Leaves 1-2 cm, (5 or)7- or 9-foliolate; petiole and rachis adaxially grooved, with appressed white medifixed trichomes; petiole 4-5 mm; stipels not visible; petiolules ca. 0.5 mm, hairy; leaflet blades opposite, obovate, obovate-oblong, oblong, or elliptic, 3-8 × 2-4 mm, abaxially pale and with appressed medifixed trichomes, adaxially green and glabrous or glabrescent, midvein adaxially impressed, secondary veins not visible, base broadly cuneate to rounded, apex obtuse to rounded and mucronate. Racemes 2-5 cm, many flowered, spinescent; peduncle ca. 5 mm; bracts linear, ca. 1.5 mm, caducous. Pedicel ca. 1 mm, hairy, deflexed in fruit. Calyx ca. 2.5 mm, with appressed medifixed trichomes; tube ca. 1 mm; teeth linear, ca. 1.5 mm. Corolla purplish red; standard obovate, 4.5-5.5 mm, outside hairy, apex rounded; wings auriculate near base, margin ciliate; keel slightly shorter than wings, outside apically hairy. Stamens 3-4 mm; anthers globose, glabrous. Ovary linear, white hairy. Legume cylindric, straight, 2-3 cm, hairy; endocarp red blotched. Seeds 6 or 7 per legume, reddish brown, oblong to cubic, 2-3 × ca. 2 mm. Fl. Jun-Jul, fr. Aug-Oct.
● Dry slopes, sunny rocks, riverbanks; 100-2700 m. Chongqing, S Gansu, Guizhou, Hubei, S Shaanxi, Sichuan, E Xizang, Yunnan.