Plants annual or short-lived perennial, sparsely covered with appressed white hairs 0.1-0.6 mm. Stems intricately branched, ascending to nearly erect or prostrate to creeping, with long internodes, up to 30 cm, sparsely hairy to subglabrous, rooting at nodes. Leaves 2.5-10 cm; stipules 2-3 mm, free, ciliate; petiole much shorter than to as long as rest of leaf, like rachis sparsely hairy; leaflets in 3-5 pairs, obovate to obcordate, 5-17 × 3-13 mm, abaxially sparsely appressed hairy, adaxially glabrous or with a few scattered hairs, apex widely rounded to distinctly emarginate. Racemes umbellate, 4-10-flowered; peduncle erect, 2.5-25 cm, sparsely hairy; bracts 0.3-1 mm, ciliate. Calyx 3-5 mm, loosely to rather densely or more rarely scarcely covered with appressed, wide and flattened, white hairs 0.1-0.3 mm; teeth 1-2(-3) mm. Petals white, pink, light red, or purple, rarely creamy yellow or yellow; standard ovate, 9-14 × 5-8 mm, apex incised; wings 7-11 mm; keel 9-14 mm. Legumes with a stipe 2-3 mm, 12-20 mm, 2.5-3.5 mm high and wide, with a slender beak up to 5 mm; valves thin, blackish, loosely hairy.
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A low herb. It is a plant which has a 2 year life-cyle. It grows to 25 cm high. The leaves have leaflets along the stalk. The flowers are on stalks above the leaves. They are pink.
Naturalized in Japan where it grows around paddy fields. Meadows at elevations of 50-1,800 metres, widespread in subtropical areas of China. Wet places, riversides, as a weed in rice fields.
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A warm temperate plant. It grows near paddy fields. It requires a dry well drained soil in a sunny position. In Sichuan and Yunnan.
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