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

18. Rheum yunnanense Samuelsson, Svensk Bot. Tidskr. 30: 713. 1936.

云南大黄 yun nan da huang

Herbs short, 30-60 cm tall. Stem 3-6 mm in diam. at base, pubescent or papilliferous. Basal leaves 1-3; petiole 5-8 cm, slender, pubescent; leaf blades reniform-cordate or broadly cordate, 5-7 × 6-8.5 cm, abaxially pubescent mainly near veins and margin, adaxially glabrous, basal veins 5, base cordate, margin entire, apex acuminate or long acuminate. Stem leaves 2 or 3, shortly petiolate, subcordate, small; ocrea 1.5-2.5 cm, membranous when dry. Panicle 1- or 2-branched, slightly spreading, pubescent. Pedicel 4-7 mm, jointed below middle, hispidulous above. Flowers large, 1-3(or 4)-fascicled. Tepals 6, spreading, purple, ovate or broadly elliptic, 5-7 mm in diam.; outer 3 smaller, 3-3.5 mm, abaxially hispidulous or long papilliferous. Stamens shorter than perianth; filaments 1.5-2 mm; anthers purple-red, subglobate. Ovary narrowly ellipsoid. Fruit purple-red, ellipsoid or ovoid-ellipsoid, ca. 1.3 × 1 cm; wings slightly broad, with longitudinal veins near margin. Fl. Jul-Aug, fr. Sep-Oct.

Slopes; ca. 4000 m. NW Yunnan [Myanmar].


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