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 hookeriana Jackson Hooker, author of Flora Boreali-Americana in which the species was first published. The plant is native to the west coast of North America from Alaska to northern California, where it grows in coastal habitat such as beaches, marshes, floodplains, and canyons. Salix hookeriana Salix hookeriana is a species of willow known by the common names dune willow, coastal willow, and Hooker's willow. "Salix hookeriana" is a shrub or tree growing up to tall, sometimes forming bushy colonial thickets. The leaves are up to 11 cm long, generally oval in shape, wavy along the edges, and hairy to woolly in