What is "rheum rhaponticum"

Pieplant \Pie"plant`\, n. (Bot.) A plant ( Rheum Rhaponticum) the leafstalks of which are acid, and are used in making pies; the garden rhubarb.

Rhubarb \Rhu"barb\, n. [F. rhubarbe, OF. rubarbe, rheubarbe, reubarbare, reobarbe, LL. rheubarbarum for rheum barbarum, Gr. ??? (and ??) rhubarb, from the river Rha (the Volga) on whose banks it grew. Originally, therefore, it was the barbarian plant from the Rha. Cf. Barbarous, Rhaponticine.]

1. (Bot.) The name of several large perennial herbs of the genus Rheum and order Polygonace[ae].

2. The large and fleshy leafstalks of Rheum Rhaponticum and other species of the same genus. They are pleasantly acid, and are used in cookery. Called also pieplant.

3. (Med.) The root of several species of Rheum, used much as a cathartic medicine.

   Monk's rhubarb. (Bot.) See under Monk.

   Turkey rhubarb (Med.), the roots of Rheum Emodi.

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.