Alisma
Description
Alisma, a member of the plant family Alismataceae, is a herb commonly used in traditional Chinese medicine (TCM). The medicinal part of the plant is the dried root of Alisma plantago-aquatica. Alisma is also called mad-dog weed, water plantain, American water plantain, or northern water plantain. It belongs to a different species from the edible plantain or cooking banana of the Caribbean or the plantain that produces psyllium seed. The Chinese name for alisma is ze xie.
Alisma is a perennial plant that grows aggressively in shallow water and boggy spots in parts of Europe, North America, and northern China. Its leaves take different shapes depending on whether the leaves grow above or in the water. The plant rarely reaches a height of more than 30 in (0.9 m). There are several subspecies of Alisma plantago found throughout the world, but their medicinal uses are the same.
General use
Alisma has been used for centuries in China. It is also used today in North America and Europe. In the categories used by traditional Chinese medicine, which classifies herbs according to energy level (hot, warm, cool, or cold) as well as taste, alisma is said to have a cold nature and a sweet, bland taste. It is used primarily to treat conditions of damp heat associated with the kidney, bladder, and urinary tract.
Alisma is a diuretic and is used to rid the body of excess water. It has mild and safe tonic qualities that especially affect the kidney and bladder. It is often combined with other herbs in general tonic formulas. It is used to treat kidney stones, pelvic infections, nephritis, and other urinary tract infections, as well as yellowish discharges from the vagina. Alisma is also believed to have an antibacterial action that helps control infection. In China, alisma is also used to help rid the body of phlegm, to reduce feelings of abdominal bloating, and to treat diabetes. The herb is also widely used in Japan.
Outside of China, alisma leaves are sometimes used medicinally. They can be applied externally to bruises and swellings, or taken internally to treat kidney and urinary tract inflammations. The roots are also used for kidney and urinary tract disorders, as well as to lower blood pressure and to treat severe diarrhea. A minor homeopathic remedy can also be made from the root.
Modern scientific research shows that alisma does act as a mild diuretic. In several studies done in Japan, alisma extracts were shown to reduce artificially induced swelling in the paws of rats. Studies using human subjects have not been done, but test tube and animal studies do seem to indicate that there is a scientific basis for some of the traditional uses of alisma. There is also some indication that alisma does have a mild antibacterial effect, but again, evidence in humans is anecdotal and by observation rather than by controlled trials.
