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 boothii tolerant of wildfire, resprouting relatively easily after aboveground parts have been burned away. Salix boothii Salix boothii is a species of willow known by the common name Booth's willow. It is native to western North America from British Columbia and Alberta south to California and New Mexico. It grows in moist mountain habitat, such as riverbanks. "Salix boothii" is a shrub which can reach in height. It is larger and has more branches in well-drained soils, and takes a smaller, simpler form in saturated areas such as bogs. The leaves are lance-shaped to oval with a pointed tip and smooth-edged