Rheum rhaponticum

(from the article `rhubarb`) any of several species of the genus Rheum (family Polygonaceae), especially Rheum rhaponticum (or R. rhabarbarum), a hardy perennial grown for its ...
Found on http://www.britannica.com/eb/a-z/r/43

Rheum rhaponticum

Rheum rhaponticum, the false rhubarb, rhapontic rhubarb or rhapontic, is a plant species found in the wild in the genus Rheum. Hyperoside, the 3-O-galactoside of quercetin, can be found in R. rhaponticum, where it serves as a UV blocker found in the bracts. It also contains the hydroxystilbenes rhaponticin and desoxyrhaponticin. ...
Found on http://en.wikipedia.org/wiki/Rheum_rhaponticum
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