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Rheum
Family: Polygonaceae
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Craig C. Freeman in Flora of North America (vol. 5)
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.
Species within checklist: Blacktail Deer Creek NEON (BLDE) plants - Northern Rockies (D12)
Rheum rhabarbarum
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