山药，原名薯蓣，始载于《神农本草经》，列为上品，具有补脾养胃，补肾涩精等功效。临床用于脾虚食少，久泻不止，肺虚咳喘，肾虚遗精，带下，尿频，虚热消渴等病症。近年来，由于用药量剧增，混伪品频频出现。现鉴别如下。１正品山药（药典品）药材来源于薯蓣科植物薯蓣... Yam, formerly known as Yam, was originally included in the “Shen Nong Ben Cao Jing” and was listed as a top grade product. It has functions such as invigorating the spleen and replenishing the stomach, and replenishing kidney and astringent essence. Clinically used to eat less spleen, diarrhea more than a long time, lung deficiency cough, kidney, nocturnal emission, vaginal discharge, frequent urination, deficiency Diabetes and other illnesses. In recent years, due to the dramatic increase in drug use, counterfeit products have frequently appeared. Now identify the following. 1 authentic yam (Pharmacopoeia) medicinal materials from the Dioscorea plant yam ...