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 discolor Salix discolor Salix discolor, the American pussy willow or glaucous willow, is a species of willow native to North America, one of two species commonly called pussy willow. It is native to the vast reaches of Alaska as well as the northern forests and wetlands of Canada (British Columbia east to Newfoundland), and is also found in the northern portions of the contiguous United States (Idaho east to Maine, and south to Maryland). It is a weak-wooded deciduous shrub or small tree growing to tall, with brown shoots. The leaves are oval, 3–14 cm long and 1-3.5 cm broad, green