Babylon Willow, Sauce lloron

Life and Mathematics. The male flowers and the leaves are arranged spirally, i.e., along a helix.
Salix babylonica is a medium- to large-sized deciduous tree, growing up to 20-25 m tall. It grows rapidly, but has a short lifespan. The shoots are yellowish-brown, with small buds. The leaves are alternate and spirally arranged, narrow, light green, 4-16 cm long and 0.5-2 cm broad, with finely serrate margins and long acuminate tips; they turn 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.[