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
Stigmella salicis a blotch, or if highly contorted with 'S' bends, a false blotch. The larvae feed on "Myrica gale", "Salix alba", "Salix atrocinerea", "Salix aurita", "Salix babylonica", "Salix caprea", "Salix cinerea", "Salix daphnoides", "Salix fragilis", "Salix lanata", "Salix pentandra", "Salix purpurea", "Salix repens", "Salix silesiaca", "Salix triandra" and "Salix viminalis". Mines on the narrow-leaved willows can be difficult to distinguish from those of "S. obliquella". The pupa is in a yellowish-brown cocoon spun in detritus and can be found in July and August, and from November through to April. "S. salicis" is found in Europe (except Iceland and Greece). Stigmella salicis