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''Rheum''〔From Ancient Greek (ῥῆον ).〕 is a genus of about 60 perennial plants in the family Polygonaceae. The genus includes the vegetable〔(Vegetable Crops Production Guide for the Atlantic Provinces )〕 rhubarb (''Rheum rhabarbarum'' or ''Rheum x hybridum''.) The species have large somewhat triangular shaped leaves with long, fleshy petioles. The flowers are small, greenish-white to rose-red, and grouped in large compound leafy inflorescences. A number of varieties of rhubarb have been domesticated both as medicinal plants and for human consumption. While the leaves are toxic, the stalks are used in pies and other foods for their tart flavor. ==Species== Species within this genus include: 〔(The Plant List ) 〕 * ''Rheum acuminatum'' Hook. f. & Thomson * ''Rheum alexandrae'' Batalin * ''Rheum altaicum'' Losinsk. * ''Rheum australe'' D. Don * ''Rheum compactum'' L. * ''Rheum cordatum'' Losinsk. * ''Rheum delavayi'' Franch. * ''Rheum emodi'' * ''Rheum forrestii'' Diels * ''Rheum glabricaule'' Sam. * ''Rheum globulosum'' Gage * ''Rheum hotaoense'' C.Y. Cheng & T.C. Kao * ''Rheum × hybridum'' Murray * ''Rheum inopinatum'' Prain * ''Rheum kialense'' Franch. * ''Rheum laciniatum'' Prain * ''Rheum lhasaense'' A.J. Li & P.G. Xiao * ''Rheum likiangense'' Sam. * ''Rheum lucidum'' Losinsk. * ''Rheum macrocarpum'' Losinsk. * ''Rheum maculatum'' C.Y. Cheng & T.C. Kao * ''Rheum maximowiczii'' * ''Rheum nanum'' Siev. ex Pall. * ''Rheum nobile'' Hook. f. & Thomson * ''Rheum officinale'' Baill. * ''Rheum palaestinum'' * ''Rheum palmatum'' L. * ''Rheum przewalskyi'' Losinsk. * ''Rheum pumilum'' Maxim. * ''Rheum racemiferum'' Maxim. * ''Reum rhabarbarum'' L. * ''Rheum rhaponticum'' L. * ''Rheum rhizostachyum'' Schrenk * ''Rheum rhomboideum'' Losinsk. * ''Rheum ribes'' * ''Rheum spiciforme'' Royle * ''Rheum subacaule'' Sam. * ''Rheum sublanceolatum'' C.Y. Cheng & T.C. Kao * ''Rheum tanguticum'' Maxim. ex Balf. * ''Rheum tataricum'' L.f. * ''Rheum tibeticum'' Maxim. ex Hook. f. * ''Rheum turkestanicum'' Janisch. * ''Rheum undulatum'' * ''Rheum uninerve'' Maxim. * ''Rheum webbianum'' Royle * ''Rheum wittrockii'' C.E. Lundstr. * ''Rheum yunnanense'' Sam. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Rheum (plant)」の詳細全文を読む スポンサード リンク
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