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巴戟天为茜草科植物巴戟天Morinda offici-nalis How的干燥根。近年来发现有用同属植物羊角藤M.umbellata L.的根做巴戟天用,羊角藤为少数地区习惯用药,不可做巴戟天用。现比较鉴别如下: 性状鉴别巴戟天:呈扁园柱形,略弯曲,长短不等,直径1～2厘米。表面浅灰黄色或浅灰黄棕色,具纵纹及深陷的横纹,有的断裂而露出部分木心,形成长短不等的节,形似连珠。质坚硬,肉厚5～7毫米,易剥落,断面皮部淡紫色或紫色。木部直径2～4毫米,坚韧,断面齿轮状黄棕色,无臭,味甘而微涩。羊角藤:多呈园柱形,略弯曲,长短不等,直径1～1.5厘米。表面灰黄色或灰黄棕色,有的微带紫红色,具不规则皱纹或较粗的纵皱纹,并有深陷
Morinda offici-nalis How is a dried root of Morinda officinalis, a Morinda plant. In recent years, it has been found that the roots of the same species of plants, M. umbellata L., are used for the purpose of making glycosides. The vine vines are used in a small number of areas and cannot be used for the purposes of the Morinda. Is now more identified as follows: Identification of traits Morinda: cylindrical flat cylindrical, slightly curved, ranging in length, diameter 1 to 2 cm. The surface is grayish-yellow or light-gray-yellowish-brown, with vertical stripes and deep horizontal stripes. Some of them break and expose some wood cores, forming knots of varying lengths and shapes. Hard, meat thickness 5 ~ 7 mm, easy to peel off, cross-section leather lavender or purple. Wood diameter of 2 to 4 mm, tough, cross-gear-like yellow-brown, odorless, sweet and slightly astringent. Crab vines: mostly cylindrical, slightly curved, ranging in length, diameter 1 to 1.5 cm. The surface is grayish yellow or gray-yellow-brown, some with purple bands, irregular wrinkles or coarse longitudinal wrinkles, and deep depressions