白活麻，中药名。为荨麻科荨麻属植物裂叶荨麻Urtica fissa Pritz.的全草。具有祛风除湿的功效。主治风湿骨痛，小儿吐乳，皮肤湿疹。
Bai-huo-ma, name of Chinese Medicinal Material. It refers to the whole plant of Urtica fissa Pritz., a plant of the Urticaceae family. It has the effects of dispelling wind and removing dampness, and is mainly used to treat rheumatic arthralgia, infantile vomiting, and skin eczema.

功效作用 功能
The efficacy and functions.

祛风除湿。主治
Dispelling wind and eliminating dampness. Mainly used for treating...

风湿骨痛，小儿吐乳，皮肤湿疹。用法用量
Rheumatic pain, infant vomiting milk, and eczema. Dosage and administration.

用量25-50g，水煎服或外洗。化学成分
Dosage: 25-50g, decoct in water for oral administration or external use. Chemical composition.

根含硝酸钾、β-谷甾醇、苯甲酸、延胡索酸等。加工炮制 采收加工
Contains potassium nitrate, β-sitosterol, benzoic acid, and corydaline. Harvest and process through specific methods.

四季采集，晒干备用。植物学信息 植物种属
Harvest in all seasons, dry and store for later use. Botanical information, plant species.

荨麻科荨麻属植物裂叶荨麻。形态特征
The plant belongs to the Urticaceae family and the Urtica genus, and it is characterized by its serrated leaves.

多年生草本。茎高60-100cm，生螫毛和反曲的微柔毛。叶对生；叶柄长1-7cm；托叶合生，卵形；叶片宽卵形或近五角形，长及宽均5-12cm，先端渐尖，基部圆形或浅心形，近掌状浅裂，裂片三角形，有不规则牙齿，下面生微柔毛，沿脉生螫毛。雌雄同株或异株；雄花序长约达10cm，生稀疏分枝，在雌雄同株时生雄花序之下；摊花直径约2.5mm，具4花被片；雌花序较短，分枝极短；雌花小，长约0.4mm，柱头画笔头状。分布区域
Perennial herb. Stem 60-100cm tall, with stinging hairs and recurved soft hairs. Leaves opposite; petiole 1-7cm long; stipules connate, ovate; leaf blade broadly ovate or nearly pentagonal, 5-12cm long and wide, gradually pointed at the apex, rounded or shallow cordate at the base, shallowly palmately lobed, lobes triangular with irregular teeth, sparsely soft hairy beneath, stinging hairs along the veins. Monoecious or dioecious; male inflorescence up to 10cm long, sparsely branched, borne below the female inflorescence in monoecious plants; expanded flower about 2.5mm in diameter, with 4 tepals; female inflorescence shorter, with very short branches; female flowers small, about 0.4mm long, with a brush-like stigma. Distribution area.

分布于浙江、湖北、四川、贵州、云南等省。生长环境
Distributed in Zhejiang, Hubei, Sichuan, Guizhou, Yunnan and other provinces. Growing environment

生于山地林中或路边。
Born in mountainous forests or by the roadside.