White yam, white yam, also known as large and long lines. Entangled network of herbaceous vine. Plant growth medium. Stem round, purple, sometimes with green stripes, D, 3 to 5 meters long; branch less. Single leaf, lower stem leaves are alternate, the upper leaves opposite, rarely whorled; blade length 6.0 cm (4.1 to 8.0), width 6.2 cm (3.5 to 9.0), petiole length 5.4 cm (3.2 to 8.5); both sides of the smooth , no pubescence, surface dark green, gray back; entire or shallow wavy edge; base of the deep heart-shaped, wide heart-shaped. tubers long and cylindrical, 90 to 120 cm long, 3-5 cm in diameter, plant weight from 1000 to 1900 grams, seedling longer, 10-20 cm long; cross-section of pure white, compact, good quality; skin brown, dense fibrous roots, large and dense tumor. White yam, commonly known as "white mouth", the taste, high nutritional value, pure green, pollution-free, since ancient times, "yam yam, the mountains of the drug" argument. 
 Edit this paragraph the value of health 

 White yam as a health food in China at least 2,000 years of history, a book in the Eastern Han Dynasty, "Shen Nong's Herbal Classic" is more the yam as the top grade. Spleen and stomach can reduce blood pressure and blood sugar, resist cancer, aging and other effects, eat good health. White yam is extremely rich in nutritional value, by laboratory analysis, hectogram containing carbohydrate 19.9 - 21.5 g, protein 1.9 - 2.25 grams of iron, zinc, copper, manganese content is also high, in addition to the rich vice with the human body needs quality renal endothelin ﹑ ﹑ choline ﹑ starch mucus glycoprotein ﹑ ﹑ ﹑ only Cha Su-free amino acid, vitamin C ﹑ amylase ﹑ diosgenin, etc., white yam juice is rich in mucus, choline, protein , polyphenol oxidase, mannose polysaccharide, phytic acid, 16 amino acids, allantoin and 3,4 - dihydroxy-phenylethylamine, etc. These are important nourishing ingredients, can be described as extremely rich in nutrients. White yam for women, is a natural slimming food. It contains enough fiber, have a sense of fullness after eating, the desire to control eating. Second, the yam itself is a highly nutritious, low-calorie foods, you can safely eat more fat and not have to worry about. And because of its low calorie, sugar-free this feature, has become the ideal food for diabetics.