Herbs, to 80 cm tall. Rhizomes short, stout, nodose. Stem leaves 2; terminal leaflet usually petiolulate, lateral leaflets subsessile; leaflets abaxially pale green or grayish white, adaxially green, ovate, oblong, or broadly lanceolate, 4-8 × 1.5-5 cm, both surfaces glabrous, base broadly cuneate, margin entire, sometimes 2-or 3-lobed, apex acuminate. Flowers pale yellow, 7-8 mm in diam.; bracteoles usually 3. Sepals obovate, 5-6 × 2.5-3 mm, apex rounded. Petals much smaller than sepals, base clawed. Stamens opposite petals, ca. 2 mm; filaments longer than anthers. Pistils shorter than stamens; ovules 2, stipitate; funiculus thickened, 7-8 mm. Seeds naked at maturity, 6-8 mm in diam.; seed coat blue, fleshy, glaucous; aril absent. Fl. May-Jun, fr. Jul-Sep. 2n = 16.
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A herb. It keeps growing from year to year. It grows 80 cm tall. It has underground stems or rhizomes. It has 2 stem leaves. It has leaflets that are pale green underneath. The leaflets are 4-8 cm long by 2-5 cm wide. The flowers are pale yellow.
It is a temperate plant. It grows in forests, bamboo thickets and moist places in valleys between 900-3,500 m above sea level in China. In Sichuan and Yunnan.
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Woods in mountains all over Japan. Forests, bamboo forests, Cathaya forests and wet places in valleys at elevations of 900-3500 metres in China.
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