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Water chestnut: also known as water chestnut, water chestnut, black taro and Tilia amurensis. , belonging to monocotyledonous Cyperaceae, is a perennial herb. There are slender creeping rhizomes with tubers at the top, common leaves and water chestnuts. The culms are numerous, clustered, upright, cylindrical and have many diaphragms. After drying, the surface of the stalk is knotted, but it is not obvious, gray-green, smooth and hairless. There are no leaves, and there are only 2 ~ 3 leaf sheaths at the base of the stem; Tunica vaginalis, yellow-green, purplish red or brown. Spikelet terminal, cylindrical, with two scales at the base, hollow and flowerless, holding the base for a week; All other scales have flowers; Smaller nuts are one and a half times as long and barbed. Nutlets are broadly obovate, biconvex, and the top does not shrink; The bottom of the style suddenly narrows from the wide bottom to a flat triangle. The flowering and fruiting period is from May to 65438+ 10.