Appearance: brown powder extracted source: for lamium plant pu lotus Mentha haplocalyx Briq. Part of the earth. Chemical composition: including the essential oil mainly for I-menthol (I-menthol), *-mint ketone (I-menthol) and mint ester etc. Detection methods: thin layer chromatography (TLC) packing: aluminum foil bag or cardboard barrels shelf life: *4 months plants form: perennial herbs, *0 to *0 cm high, it was the fragrance. Rhizomes prostrate. Vertical stem, square, have branches, and a fall born pubescent. Leaves opposite, lanceolate, ovoid or round long, apex sharp pointed or acuminate, base cuneate, margin serrulate, both born of short pubescent and gland scales. Wheel umbrella inflorescence axillary; Bracts lanceolate or linear lanceolate, is predestined friends the hair; Calyx bell, outside be soft hairy and gland scale, with *0 arteries and veins, 5 cracked tooth; Corolla green purple, pink or white, crown eaves 4 crack, *-lobed, 2 crack, bigger, stamens 4. Small nuts ovoid. Flowering 8 ~ *0 months, fruiting 9 ~ *1 months. Jiangsu, henan, anhui, JiangXiYou cultivated large area. Condition of summer and autumn YeMaoCheng or flower stem to 3 rounds, cutting in time if talent, dry or dry. Sexual flavour of cool, taste bitter. Major functions: xuan scattered wind hot, clear leader, appear the rash. Used for wind hot cold, wind WenChu up, headache, red eyes and throat bi, KouChuang, rubella, measles, bosom frowsty bilge threat.