柳树（属柳属）包含许多种类和杂交品种，通常是落叶乔木和灌木。它们主要分布在寒冷和温带地区的湿润土壤上

, sallows and osiers, of genus Salix, comprise many species and numerous hybrids of typically deciduous trees and shrubs. They are primarily found on moist soils in cold and temperate regions