| Noun | 1. | genus Rheum - rhubarb dicot genus, magnoliopsid genus - genus of flowering plants having two cotyledons (embryonic leaves) in the seed which usually appear at germination buckwheat family, family Polygonaceae, Polygonaceae - a family of plants of order Polygonales chiefly of the north temperate zone; includes the buckwheats rhubarb plant, rhubarb - plants having long green or reddish acidic leafstalks growing in basal clumps; stems (and only the stems) are edible when cooked; leaves are poisonous Himalayan rhubarb, red-veined pie plant, Rheum australe, Rheum emodi, Indian rhubarb - Asian herb (Himalayas) |