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 babylonica translations): Despite these Biblical references to "willows", whether in Latin or English, the trees growing in Babylon along the Euphrates River in ancient Mesopotamia (modern Iraq) and named "gharab" in early Hebrew, are not willows ("Salix") in either the modern or the classical sense, but the Euphrates poplar "(Populus euphratica)," with willow-like leaves on long, drooping shoots, in the related genus "Populus." Both "Populus" and "Salix" are in the plant family Salicaceae, the willow family. These Babylonian trees are correctly called poplars, not willows, in the New International Version of the "Bible" (English, 1978): Salix babylonica Salix babylonica (Babylon willow