Rhubarb

The name of several large perennial herbs of the genus Rheum and order Polygonaceae.

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.

The root of several species of Rheum, used much as a cathartic medicine.

plants having long green or reddish acidic leafstalks growing in basal clumps; stems (and only the stems) are edible when cooked; leaves are poisonous