White Willow Bark P.E.
The bark of Salix alba Linn., a white willow of the willow family. Deciduous tree, 10~12 meters high. There are long, drooping branches, the lower branches are brown and glabrous, and slightly hairy when young. The leaves are lanceolate, or linear-lanceolate, 9~16cm long, 5~15 wide, apex long and tapering, base-shaped. The flowering period is 3~4 months, and the fruit period is 4~5 months. It can be harvested all year round and used for tree bark. It is found in waterside wetlands and is cultivated all over the country. It is mainly distributed in the Yangtze River Basin and South China.