知母别名蒜瓣子草或羊胡子根,属百合科多年生草本植物,叶细长,丛生,花小,白色,有淡紫色条纹,穗状花序,蒴果长椭圆形。地下根茎入药,以生年3年以上者疗效较高。根茎中含有多种甾类皂甙,还含有黄酮甙、芒果甙、单宁、粘液质、脂肪油等。具有清热、除烦、滋阴、止渴等功效,主治烦热、口渴、肺热、燥咳、午后潮热等症状。主产河北山区、山西、陕西、内蒙古等地。此外,甘肃、河南、山东、辽宁、黑龙江等省 Anemarrhena alias garlic petals or sheep mustard root, is a liliaceous perennial herb, leaves slender, tufted, flowers small, white, with lavender stripes, spikes, capsule oblong. Rhizome underground medicine, to more than three years of birth have a higher efficacy. Rhizome contains a variety of steroidal saponins, also contains flavonoid glycosides, mangiferin, tannins, mucus, fatty oils. With heat, Chufan, Ziyin, thirst quencher and other effects, attending irritability, thirst, Hyperactivity, dry cough, afternoon hot flashes and other symptoms. Produced mainly in Hebei mountains, Shanxi, Shaanxi, Inner Mongolia and other places. In addition, Gansu, Henan, Shandong, Liaoning, Heilongjiang and other provinces