Salix babylonica a gold-yellow in autumn. The flowers are arranged in catkins produced early in the spring; it is dioecious, with the male and female catkins on separate trees. "Salix babylonica" was described and named scientifically by Carolus Linnaeus in 1736, who knew the species as the pendulous-branched ("weeping") variant then recently introduced into the Clifford garden in Hartekamp in The Netherlands. Early Chinese cultivar selections include the original weeping willow, "Salix babylonica" 'Pendula', in which the branches and twigs are strongly pendulous, which was presumably spread along ancient trade routes. These distinctive trees were subsequently introduced into England from Aleppo in
Salix denticulata present in Afghanistan, Pakistan, Nepal, India and the Chinese provinces of Sichuan, Tibet and Yunnan. Its typical habitat is gullies and river valleys at around . Salix denticulata Salix denticulata is a species of shrub or small tree in the family Salicaceae. It is a mountain species endemic to the Himalayan region. "Salix denticulata" can reach a height of . The shoots are downy when young. The dull green leaves are paler underneath, obovate, lanceolate or elliptic, with toothed margins, long, with very short petioles. Like all willows this species is dioecious. Male catkins are long, with yellow anthers, and