Several species are cultivated as ornamentals. A few species of "Triplaris" provide lumber. The fruit of the sea grape ("Coccoloba uvifera") is eaten, and in Florida, jelly is made from it and sold commercially. The seeds of two species of "Fagopyrum", known as buckwheat ("sarrasin" in French), provide grain (its dark flour is known as "blé noir" (black wheat) in France). The petioles of rhubarb ("Rheum rhabarbarum" and hybrids) are a food item. The leaves of the common sorrel ("Rumex acetosa") are eaten in salads or as a leaf vegetable.