The Salix genus’s trees, shrubs, and willows in the Salicaceae family are mainly native to northern temperate zones. They are prized for their ornamentation, timber, erosion control, and shade. The Salix genus includes about 400 species of deciduous shrubs and trees.
All species have alternating, mostly narrow foliage and male and female catkins on separate trees. Three of the larger willows are black (Salix nigra), brittle or cracked (Salix fragilis), and white (Salix alba), all being 65 feet (20 meters) or more; the former is North American, but the other 2 Eurasians are largely naturalized.
All of them are common in flatland locations. The Chilean willow (Salix chilensis) is widespread from Chile to Mexico and reaches 18 meters. Columnar willow (Salix chilensis fastigiata) is a particularly common variety in Xochimilco, close to Mexico City.
The flowers come in green and white.