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 amygdaloides Salix amygdaloides Salix amygdaloides, the peachleaf willow, is a species of willow native to southern Canada and the United States, from Quebec west to western British Columbia, southeast to eastern Kentucky, and southwest and west to Arizona and Nevada, respectively. It is a small to medium-sized deciduous tree, growing to tall; besides the cottonwoods, it is the largest tree native to the prairies. It has a single trunk, or sometimes several shorter trunks. The leaves are lanceolate, long and wide, yellowish green with a pale, whitish underside and a finely serrated margin. The flowers are yellow catkins, long, produced in