薯莨是一种多年生的野生藤本植物,俗名血酱头、羊头芋、珠砂连等,多产于我国南方两广、福建、四川、云南、贵州、湖南等省山区地方。其块根形状大小不一,有胡芦形、园形、长形、藕笋形等。外皮较厚,为棕黑色,粗裂具条纹,内肉为红色、黄色或白色。小的重四、五两,大的重数斤。根据我们的分析,鲜薯莨内含单宁4～8%, Dioscorea is a perennial wild lianas, common name blood sauce head, sheep taro, pearls even, prolific in southern China Guangdong and Guangxi, Fujian, Sichuan, Yunnan, Guizhou, Hunan and other provinces in the mountains. The root shape of the different sizes, there are Hulu, garden, long, such as lotus root shoots. Rind thick, brown-black, rough cracked, the meat is red, yellow or white. Small heavy four, five two, big heavy jin. According to our analysis, fresh potato butter contains 4 ~ 8% tannin,