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FOC | Family List | FOC Vol. 5 | Polygonaceae | Polygonum

41. Polygonum viviparum Linnaeus, Sp. Pl. 1: 360. 1753.

珠芽拳参 zhu ya quan shen

Herbs perennial. Rhizomes black-brown, contorted, large, 1-2 cm in diam. Stems usually 2 or 3 from rhizome, erect, 15-60 cm tall, simple. Basal leaves long petiolate; leaf blade linear, ovate-lanceolate, or oblong, 3-10 × 0.2-3 cm, leathery, base rounded or cuneate, margin slightly involute, apex acute. Cauline leaves shortly petiolate or subsessile; leaf blade lanceolate smaller than basal ones; ocrea: lower part green, upper part brown, tubular, oblique, membranous, not ciliate. Inflorescence terminal, spicate, lower part with bulbils; bracts ovate, membranous. Perianth white or pinkish, 5-parted; tepals broadly elliptic, 2-3 mm. Stamens usually 8. Styles 3, connate at base. Achenes included in persistent perianth, dark brown, shiny, ovoid, trigonous, ca. 2 mm. Fl. May-Jul, fr. Jul-Sep. 2n = ca. 12*.

Forest margins, grassy slopes, alpine steppes; 1200-5100 m. Gansu, Guizhou, Hebei, Heilongjiang, Henan, Hubei, Jilin, Liaoning, Nei Mongol, Ningxia, Qinghai, Shaanxi, Shanxi, Sichuan, Xinjiang, Xizang, Yunnan [Bhutan, India, Japan, Kazakhstan, Korea, Kyrgyzstan, Mongolia, Myanmar, Nepal, Russia, Sikkim, Tajikistan, Thailand; SW Asia, Europe, North America].

1 Leaf blade oblong or ovate-lanceolate, 5-30 mm wide.   41a var. viviparum
+ Leaf blade linear, 2-3 mm wide.   41b var. tenuifolium


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