甘遂（拉丁学名：Euphorbia kansui T. N. Liou ex S. B. Ho），多年生草本，高25-40cm。别名主田、重泽、甘藁、陵藁、甘泽、苦泽、白泽、鬼丑、陵泽、为大戟科大戟属的植物，为中国的特有植物。分布于中国大陆的甘肃、山西、陕西、宁夏、河南、青海等地，多生在低山坡、荒坡、沙地、田边和路旁等，已由人工引种栽培。可作药用.
Also known as Euphorbia root, Radix Kansui, and radix Euphorbiae Kansui, medicinally it refers to the dried roots of Euphorbia kansui T.N.Liou ex T.P.Wang, one of plant that belongs to family Euphorbiaceae. It is usually harvested before the flowering in spring or after the wilting of stems and leaves in autumn. And then it needs to remove skin, dry in the sun. And usually it is used raw or processed with rice vinegar. This herb is mainly distributed in mainland China, including Gansu, Shanxi, Shaanxi, Ningxia, Henan and other places. Habitats include low hills, slopes, sand, edge of paddy field, roadsides, etc. Today this wild plant is domesticated and most of the commercial items are mainly from cultivation.
Its plant is a succulent perennial herb, 25 to 40cm high and the whole plant contains milk. Roots are slender and slightly curved, but some are like a chain of pearls, bar, or elongated oval. Skin is tan. Stems are erect and light purple red. Leaves are alternate, narrow lanceolate or linear-lanceolate, 3 to 5cm long, 6 to 10mm wide, and with obtuse apex, broadly cuneate base, and entire margin. Cyathium is arranged in cymose, usually 5 to 9 clus
Kan Sui is bitter in taste and cold and toxic in properties. It covers meridians of spleen, lung, kidney, bladder, large intestine, and small intestine. Primary functions are purgating excessive fluid and relaxing the bowels. Main Euphorbia Kansui uses and indications include edema, ascites, accumulation of pathogens in chest, epilepsy, cough, dysuria and constipation, and more. Recommended kansui dosage is from 0.5 to 1 gram in teapills or powder.