Eleocharis tuberosa (scientific name: Heleocharis dulcis (Burm. f.) Trin.), also known as horseshoe, water chestnut, black taro, bodhi, etc., belongs to monocotyledonous Cyperaceae and is a perennial herb. There are slender creeping rhizomes, and tubers are born at the top of the creeping rhizomes, with common leaves and water chestnuts. The culms are numerous, clustered, upright, cylindrical, with many transverse diaphragms. After drying, the surface of the culms has nodes, but they are not obvious, gray-green, smooth and hairless. Leaves are absent, and there are only 2-3 leaf sheaths at the base of the stalk; Sheath is membranous, green-yellow, purplish red or brown. Spikelets are terminal and cylindrical, and there are two scales at the base of spikelets, which are hollow and flowerless, and hold the base of spikelets for a week; All the other scales have flowers; Smaller nuts are one and a half times longer and have barbs; Stigma 3. Nutlets are broadly obovate, biconvex, and the top is not constricted; The style base abruptly narrows from a wide base to a flat triangle. Flowering and fruiting period may 5- 10/0 month.

Eleocharis tuberosa is an enlarged bulb at the apex of the underground stolon of Eleocharis tuberosa, a Cyperaceae plant. It has a slender creeping rhizome, and tubers are produced at the top of the creeping rhizome.

It is native to China and widely distributed all over the world. It is cultivated all over China, especially in tropical and subtropical regions. The skin of Eleocharis tuberosa is purple-black, the meat is white, the taste is sweet and juicy, crisp and delicious, and it can be eaten as both raw fruit and vegetables. Bulbs are rich in starch, which is delicious for raw food, cooked food or starch extraction. It is also used for medicine, appetizing and detoxifying, eliminating overnight food and strengthening the stomach.