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Rheum

(Genus)

Overview

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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 ca. 60: introduced; temperate regions, Eurasia.[1]

Taxonomy

The Genus Rheum is further organized into finer groupings including:

Bibliography

Footnotes

  1. Craig C. Freeman "Rheum". in Flora of North America Vol. 5. Oxford University Press. Online at EFloras.org.

Sources

Last Revised: August 24, 2012
2012/08/24 16:35:55