Description from Flora of China
Indigofera henryi var. silvarum Craib; I. souliei Craib; I. subsecunda Gagnepain; I. subverticillata Gagnepain, nom. illeg. superfl.
Shrubs or shrublets, erect or ascending, 30-100 cm tall, many branched. Branches brown, angular, with appressed white medifixed 2-branched trichomes. Stipules linear, ca. 5 mm. Leaves 3-10 cm, 11-19-foliolate; petiole 3-10 mm; rachis adaxially flattened, slightly winged, with appressed white medifixed trichomes; stipels ca. 1 mm; petiolules ca. 1 mm; leaflet blades opposite, oblong-obovate, 1.7-2.3 × 0.5-1.2 cm, papery, abaxially with spreading unequally 2-branched trichomes, adaxially with appressed medifixed trichomes, midvein prominent on both surfaces, secondary veins 4-6 on each side of midvein but not visible or obscure, base broadly cuneate, rounded, or truncate, apex rounded. Racemes (3-)4-9(-12) cm, laxly flowered; peduncle 7-12 mm, with sparse medifixed trichomes; bracts linear, 2-2.5 mm, caducous. Pedicel 2-6(-9) mm, deflexed in fruit. Calyx 2-3 mm, outside with appressed white medifixed trichomes; tube 1-1.5 mm; teeth triangular, 1-1.5 mm, apex acuminate. Corolla white; standard obovate, 7-9 × 5-6 mm, outside densely white puberulent with medifixed trichomes, base rounded, apex rounded to acute; wings 7-8 × ca. 2.5 mm, margin ciliate; keel 7-9 mm. Stamens 7-8 mm; anthers ovoid-globose, base densely hairy. Ovary hairy. Legume brown, cylindric, 2.5-3 cm, with sparse appressed medifixed trichomes; endocarp blotched. Fl. Aug-Sep, fr. Oct-Nov.
Indigofera subverticillata was nomenclaturally superfluous when published, and is therefore illegitimate, because the single gathering cited in the protologue is also the type of the senior name I. souliei.
● Grasslands, slopes, scrub near trailsides; 1200-2500 m. Guizhou, S Sichuan, Yunnan.