Rubus parvifolius L., also known as Azure Land White Grass, Hongmeixiao and March Soap, is derived from the stems and leaves of Rubus parviflorius L., a Rosaceae plant. Small deciduous shrub in plant form, pricked by short hair and inverted skin. The trifoliate compound leaves are alternate, the top leaflets are large, broadly obovate or nearly round, 2.5~5cm long and 2~5cm wide, with irregular serrations on the edge, sparse hairs on the top and dense white fluff on the bottom; Calyx 5-lobed, villous or spiny; Petals 5, pink, obovate; Stamens are numerous; Carpels are numerous, separated, and born on raised receptacle. Aggregate fruit is spherical and red when ripe. The flowering period is from May to June, and the fruiting period is from July to August. Born on hillsides, roadsides, wasteland bushes and grass. Distributed in East China, Central South China, Sichuan, Hebei, Shanxi and Shaanxi. Collect stems and leaves in summer, dry them or use them fresh. Chemical composition leaves contain tannins; The pre-test stems contain phenols and tannins. The taste is flat, sweet and sour. Functions: removing blood stasis, relieving pain, detoxifying and killing insects. Used for hematemesis, traumatic injury, postpartum abdominal pain, dysentery, hemorrhoids and scabies.