Difference between revisions of "Rheum"
Sp. Pl. 1: 371. 1753: Gen. Pl. ed. 5, 174. 1754.
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|publication year=1754 | |publication year=1754 | ||
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|subfamily=Polygonaceae subfam. Polygonoideae | |subfamily=Polygonaceae subfam. Polygonoideae | ||
|genus=Rheum | |genus=Rheum | ||
Revision as of 17:35, 18 September 2019
Herbs, perennial; roots fleshy. Stems erect, glabrous or pubescent. Leaves deciduous, mostly basal, alternate, petiolate; ocrea persistent or deciduous, chartaceous; blade cordate-ovate to orbiculate or reniform, margins entire, undulate. Inflorescences terminal, paniclelike, pedunculate. Pedicels present. Flowers bisexual, 1–10 per ocreate fascicle, base stipelike; perianth nonaccrescent in fruit, whitish green or pinkish green, campanulate, glabrous; tepals 6, distinct, sepaloid, dimorphic, outer 3 narrower than inner 3; stamens (6–)9; filaments distinct, free, glabrous; anthers yellow or pinkish, elliptic; styles 3, erect or deflexed, distinct; stigmas capitate. Achenes exserted, dark brown, winged, 3-gonous, glabrous. Seeds: embryo straight or curved. x = 11.
Distribution
temperate regions, Eurasia.
Discussion
Species ca. 60 (1 in the flora).