Dioscorea villosa / Wild Yam / Dioscoreaceae (Yam family)

Information

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Other Names

China root, Colic Root, Devil's Bones, Dioscorea, Huang Yao Tzu, Mexican Wild Yam, Rheumatism Root, Shu Yu, Wild Yam, Wild Yamwurzel, Yabani Hindelmasi, Yam, Yuma.

Description

Wild yam is a climbing vine found in tropical and warmer climates. Historically, people used the root of the plant for food and medicine. Dioscorea contains up to thirteen percent diosgenin. Until 1970, this was the sole source for the producing of anti-conceptive pills. The plant is also used as a herbal medicine in China. Diosgenin has been processed to control fertility. (3)

Contents

Diosgenin, a steroid sapogenin, is the product of hydrolysis by acids, strong bases, or enzymes of saponins, extracted from the tubers of Dioscorea wild yam. The sugar-free, aglycone, diosgenin is used for the commercial synthesis of cortisone, pregnenolone, progesterone, and other steroid products. (4)

Historical

"Early Americans used wild yam to treat colic; hence, the term colic root. Traditionally, it has been used to treat inflammation, muscle spasms and a range of disorders including asthma. Related species of Dioscorea are used in the Amazon and in central America to treat conditions including fever, urinary tract infections, colds, rheumatism (joint and muscle related conditions), arthritis, hemorrhoids, boils, and dysentery."(1)
"In the 18th and 19th centuries, wild yam ( Dioscorea villosa ) was used by herbalists to treat menstrual cramps and problems related to childbirth. The subsequent discovery of a substance contained in wild yams revolutionized the pharmaceutical industry. The tubers, or fleshy, root-like parts, of wild yams (not to be confused with the sweet potato yam) contain diosgenin, a steroid-like substance that is involved in the production of the hormone progesterone. Diosgenin has served a key role in the making of hormones and the development of the birth control pill, two of the major advances in plant drug medicine this century. Wild yam continues to be used for treating menstrual cramps, nausea and morning sickness associated with pregnancy, inflammation, osteoporosis, menopausal symptoms, and other health conditions."(1)
"While the diosgenin found in wild yam created quite a stir in the 1990s as a cure for menopausal disorders and other symptoms of aging in women, the plant itself has no proven hormonal action, nor have any studies shown it to be effective in treating hormone related disorders."(1)

Plant Description

This is an herbaceous, slender vine, found throughout the United States, but more common in the central and southern portions. The stem is a smooth green twiner, about the size of a goose-quill, twining from the right to the left, over fences, bushes, etc. The leaves are symmetrical and heart-shaped, gradually tapering to a sharp, acuminate point, and are borne on leaf stalks from 2 to 4 inches long. The flowers appear in June or July, are dioecious, very small, and greenish-yellow. (2)

References

(1) Wild yam, University of Maryland Medical Center
(2) Dioscorea.—Wild Yam., King's American Dispensatory
(3) Wild yam, Raintree Tropical Plant Database
(4) Diosgenin, Wikipedia