Indigofera pseudonigrescens X.F. Gao & Xue Li Zhao, sp. nov. (Figs. 3, 4).

Type:— CHINA. Sichuan: Miansha Town, Mianning County, 1400 m, 28°26’57’’N, 101°52’20’’E, 2 August 2007, X. F. Gao et al. 9796 (holotype CDBI!, isotypes CDBI!).

Shrubs, erect, 50–100 cm tall. Stems reddish brown; young braches green, striate, with appressed white and brown medifixed symmetrically 2-branched trichomes. Stipules linear, ca. 3mm. Leaves 2–10 cm, 5–13-foliolate; petiole and rachis with dense appressed medifixed trichomes; petiole 0.4–1.5 cm; rachis adaxially grooved; stipels narrowly triangular, ca. 1 mm; leaflet blades opposite or subopposite, elliptic to obovate-elliptic, (0.7–)1–2.5 × 0.4–1.2 cm, papery, abaxially with short appressed medifixed trichomes, adaxially with dense longer appressed medifixed trichomes, base broadly cuneate to rounded, apex obtuse and mucronate. Racemes (3–)5–19(–26) cm; peduncle ca. 0.5–2.3 cm; bracts linear, 1–1.5 mm, abaxially with brown medifixed trichomes, caducous. Pedicel ca. 1 mm, with brown medifixed trichomes. Calyx 2–2.5 mm, with appressed brown and white medifixed trichomes; tube ca. 1 mm; teeth narrowly triangular, 1–1.5 mm. Corolla red to purple; standard ovate, 4–6 × 2–3 mm, outside with appressed brown and white medifixed trichomes, apex acute, inside apex hairy; wings ca. 4 mm, margin ciliate; keel slightly longer than wings, outside apically with appressed brown and white trichomes, spur ca. 1 mm. Stamens 4–5 mm; anthers ovoid-globose, base with a few trichomes. Ovary glabrous. Legume cylindric, with dense appressed brown and white trichomes when young. Fl. Jun.–Sep., fr. unknown.

Distribution and habitat:— Indigofera pseudonigrescens is known from Mianning and Yanbian County in southwestern Sichuan, growing on roadside, hill slopes, forest margins at elevation of 1400–2000 m.

Etymology:— The epithet refers to its resemblance to Indigofera nigrescens .

Additional specimens examined:— CHINA. Sichuan Province: Mianning County, Maidigou Town, 28° 19’14’’N, 101°54’26’’E, 1500 m, 4 July 2014, X. L. Zhao 2014-1 (CDBI) ; Yanbian County, Gesala Town, 27°04’14’’N, 101°20’27’’E, 1760 m, 29 July 2007, X. F. Gao et al. 9738 (CDBI) .