Description from Flora of China
Indigofera kirilowii var. alba Q. Z. Han; I. macrostachya Bunge (1858), not Ventenat (1804).
Shrubs, 30-10 cm tall. Stems terete; young branches angular, with sparse appressed medifixed 2-branched trichomes, glabrescent. Stipules lanceolate, 4-6 mm, caducous. Leaves 6-15 cm, (5 or)7-11-foliolate; petiole and rachis flat, adaxially slightly grooved, glabrous or with appressed medifixed trichomes; petiole 0.1-2.5(-3) cm; stipels subulate, 2-3 mm, persistent; petiolules ca. 2.5 mm, densely hairy; leaflet blades opposite, broadly ovate, ovate-rhombic, or elliptic, 1.5-4(-5) × 1-2.3(-3) cm, papery, both surfaces with appressed medifixed trichomes, abaxially pale green, adaxially darker, midvein abaxially obviously prominent and adaxially slightly prominent, secondary veins obvious, base cuneate to broadly cuneate, apex rounded to acute. Racemes 5-12(-20) cm; rachis striate, with sparse appressed white medifixed trichomes; bracts linear-lanceolate, 2-5 mm. Pedicel 3-5 mm, glabrous. Calyx campanulate, 2.5-4 mm, glabrous; tube ca. 1.5 mm; teeth triangular, shorter than to ± equaling tube, most abaxial one ca. 2 mm, margin ciliate. Corolla pink or rarely white; standard elliptic, 1.2-1.4(-1.8) × ca. 0.8 cm, outside glabrous, margin ciliate, apex obtuse; wing margin ciliate. Stamens 1.2-1.4 cm; anthers broadly ovoid, both ends hairy. Ovary glabrous. Legume brown, cylindric, 3.5-7 cm × ca. 5 mm, glabrous; endocarp blotched. Seeds more than 10 per legume, reddish brown, oblong, ca. 5 × 2.5 mm. Fl. May-Jul, fr. Aug-Oct. 2n = 16.
Scrub on slopes, woodlands; 100-400 m. Hebei, Henan, Jiangsu, SE Jilin, Liaoning, Nei Mongol, Shaanxi, Shandong, Shanxi [Japan, Korea].