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

3. Rheum webbianum Royle, Ill. Bot. Himal. Mts. 1: 318. 1839.

须弥大黄 xu mi da huang

Herbs large, 0.5-1.5 m tall. Stem stout, hollow, finely sulcate, glabrous or papilliferous on upper part. Petiole of basal leaf shorter than blade, stout, papilliferous; leaf blade green adaxially, reniform-cordate to cordate, 20-25 × 25-30 cm, shorter than wide, nearly leathery, adaxially muricate, basal veins 5, base broadly cordate, margin slightly sinuolate, apex obtuse. Stem leaves ovate, smaller. Panicle large, 1- or 2-branched. Flowers small. Tepals yellow-white, elliptic, jointed below middle of pedicel. Fruit broadly ellipsoid or orbicular, 1-1.2 cm, ca. as long as wide, both ends slightly retuse; wings ca. 3.5 mm, broad, longitudinal veins near margin. Seeds narrowly ovoid-ellipsoid, ca. 4 mm wide. Fr. Aug-Sep. 2n = 44.

Slopes; 3500-3600 m. SW Xizang [NW India, Kashmir, Nepal, Pakistan].


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