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 myrtilloides new leaves appear. The leaves resemble bilberry ("Vaccinium uliginosum") leaves in shape, hence the name in the Finnish and Swedish languages, which translates as "bog bilberry willow". A very similar, closely related species, "Salix pedicellaris" (bog willow), occurs in northern North America; it is classified as a variety of swamp willow "S. myrtilloides" var. "pedicellaris" by some botanists. Salix myrtilloides Salix myrtilloides, the swamp willow, is a willow native to boglands in cool temperate to subarctic regions of northeastern Europe and northern Asia from central Norway and Poland eastwards to the Pacific Ocean coasts, with isolated populations further south in