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Published In: Species Plantarum 1: 371. 1753. (1 May 1753) (Sp. Pl.) Name publication detailView in BotanicusView in Biodiversity Heritage Library
 

Project Name Data (Last Modified On 6/2/2011)
Acceptance : Accepted
Project Data     (Last Modified On 6/3/2011)
General/Distribution: A genus with about 50 species, distributed in temperate and subtropical Asia. In Pakistan it is represented by 6 species.

 

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Perennial herbs or undershrubs with thick rhizomes. Stem solid or fistular, smooth or furrowed, glabrous or pubescent or plant acaulescent. Leaves often very large, forming a basal rosette, simple, reniform, palmately veined, entire, toothed or lobed. Ochreae scarious. Inflorescence a panicle or spike-like with the flowers born in clusters. Flowers bisexual; pedicels articulate. Perianth segments 6 in 2 whorls, distinct or connate at base, equal or outer whorl usually slightly larger, not accrescent. Stamens mostly 9, rarely 6, borne on a ring adnate to the perianth. Ovary (2-) 3 (-4)-angled; stigmas 3, capitate, styles very short. Fruit 3-angled, 2-4-winged, wings varying in size and colour. Seeds with broad cotyledons and straight embryo.
 

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1 Plants without distinct stem. Leaves all basal. (2)
+ Plants with distinct stem. Leaves basal and cauline both or stem leafless. (3)
2 (1) Flowers in leafless panicles. Fruits nearly orbicular, notched at both ends. 4 Rheum tibeticum
+ Flowers in spike-like racemes. Fruits ellipsoid not notched at both ends. 3 Rheum spiciforme
3 (1) Flowers in panicles. (4)
+ Flowers in fascicles. 2 Rheum ribes
4 (3) Flowers white-pink or pale yellowish. Basal leaf blade up to 50 cm long but never exceeding; upper surface glabrous or papillose. (5)
+ Flowers dark purple. Basal leaf blade up to 60 cm long; upper surface somewhat scabrous above. 1 Rheum australe
5 (4) Fruits 13-15 mm across. Flowers white to pink. 6 Rheum wittrockii
+ Fruits 8-10 mm across. Flowers pale yellowish. 5 Rheum webbianum
 
 
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