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Rhizoma Dioscoreae/common Yam Rhizome

[name of Chinese medicine] yam shanyao [English name] Dioscoreae Rhizoma. [Source] Dioscorea plant Dioscorea opposita Thunb. rhizome. [Plant form] perennial herb. Roots erect, cylindrical, fleshy hypertrophy, up to 1 meter in length, diameter 2 to 7 centimeters, gray-brown skin, with a majority...

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[name of Chinese medicine] yam shanyao

[English name] Dioscoreae Rhizoma.

[Source] Dioscorea plant Dioscorea opposita Thunb. rhizome.


[Plant form] perennial herb. Roots erect, cylindrical, fleshy hypertrophy, up to 1 meter in length, diameter 2 to 7 centimeters, gray-brown skin, with a majority of fibrous roots, crisp, white section, sticky. Stems right-handed, slender, often purplish, with vertical grooves. Leaves alternate, to above the middle of the opposite, leaf pods often buds (zero more than a child), leaf shape change, triangular ovate to triangular-shaped wide oval, usually 3 crack, base braided heart-shaped, 7 to 9 veins, base Out. Minimal flowers, parthenocarpic, spikelike, male inflorescence erect, inflorescence axis twisty, female inflorescence drooping; tepals 6, abaxially brown hairs, scattered with purple-brown glands, male flowers with 6 stamens. The follicle surface is covered with white powder. Seeds have brown wings. Flowering from June to August, fruiting period from August to October.


[Origin distribution] Born in the sunny edge of forest or shrub, often cultivated. The main production Henan, Shaanxi and other places.


[Harvesting and Processing] After the stems and leaves wither in winter, excavate, cut the roots, wash, remove the skin and fibrous roots, smoke and dry with sulfur, there are also choices for straight and straight yam, home water, dip to no dry, stuffy Thoroughly, smoked with sulphur, cut both ends, smashed into a cylindrical shape with a wooden board, dried, lighted, commonly known as "light yam".


[Herb character]Slightly cylindrical, curved and slightly flat, 15 to 30 cm long and 1.5 to 6 cm in diameter. The surface is yellowish-white or yellowish, with longitudinal grooves, longitudinal wrinkles, and root scars. Occasionally light brown skin remains. Weight, solid quality, difficult to break, cross-section white, powdery. Odorless, mild, slightly sour, chewing sticky. Light yam cylindrical, both ends flush, length 9 to 18 cm, diameter 1.5 to 3 cm. Smooth surface, white or yellowish white.


[Tropism of taste] is flat and sweet. Spleen, lung, kidney.

[Effects and Functions] Spleen and Stomach, Spleen and Lung, Kidney and Astringent Essence. Is a tonic medicine subordinate classification of qi drugs.


[Clinical application] dosage 15 ~ 30 grams, oral decoction. With the rule of spleen deficiency, eat less, long diarrhea, lung deficiency cough, kidney deficiency, nocturnal emission, vaginal discharge, urinary frequency, heat diabetes and so on. Bran fried yam and spleen and stomach, with less spleen food, diarrhea, loose stools, too much leucorrhea.

Pharmacological studies The results of modern pharmacological tests have shown that it can promote fracture healing, lower blood sugar, enhance immune function, and enhance the function of the digestive system.


[chemical composition] contains dopamine, saponin, alizarin II, stigmasterol, cholesterol, saliphatic hydrochloride, ergosterol, quinic acid, rapeseed oil, cholesterol, diosgenin, allantoin, vegetable oil sterol, two Hexadecanoic acid, β-sitosterol; additionally contains free amino acids, starch, tannin, mucilage, glycoprotein, polyphenol oxidase and other ingredients.


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