Rheum
Rheum (Rhubarb) are robust rhizomatous perennials adorned with impressive, heart-shaped leaves and tall flowering stalks boasting large feathery plumes of tiny flowers. Rhubarbs can be strictly ornamental (Rhubarb palmatum) or they can be vegetables grown for their beautiful, edible leaf stalks which are used most often in pies, jams, and compotes. Careful: all rhubarb leaves are highly toxic, so keep them out of your kitchen.