Shrubs, erect, 1-3 m tall, much branched. Branchlets adpressed pilose. Leaves 3-foliolate; petiole 1-2.5 cm; leaflets broadly ovate, ovate-elliptic, or obovate, terminal one 1.5-4.5 × 1-3 cm, abaxially adpressed pilose, adaxially glabrous, apex rounded or emarginate, apiculate. Racemes axillary, shorter than subtending leaves, rarely subequal to leaves; peduncle short or inflorescences subsessile. Pedicel short, white hairy. Calyx 2-2.5 mm, 5-lobed; lobes lanceolate. Corolla reddish purple, ca. 1.1 cm; standard obovate, base clawed; wings oblong, ca. 1/3 shorter than standard and keel, base distinctly auriculate, clawed; keel subequal to standard, base auriculate, clawed. Legume globose, slightly flat, 6-7 × ca. 5 mm, densely hairy, reticulate veined. Fl. Jul-Aug, fr. Sep. 2n = 22.
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A shrub. It grows 1-3 m tall. The leaves have 3 leaflets. The leaflets are broadly oval and the end one is 2-5 cm long by 1-3 cm wide. They are hairy underneath. The flowers are in the axils of the leaves. The pod is round and flattened and 6-7 mm long by 5 mm wide.
Meadows and grassy places in hills and low mountains, C. and S. Japan. Dry mountain slopes, thickets and forests; at elevations up to 1,500 metres.
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It is a temperate plant. It grows in north China on mountain slopes below 1,500 m above sea level.
Can be grown by cuttings or seedlings. Seeds needs soaking.
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