Willow tree in fall 照片檔

Willows, form the genus Salix, around 400 species[ of deciduous trees found primarily on moist soils in cold and temperate regions. "nAt the base of the stalk that joins the leaf to a stem,"na pair of stipules form. These may fall in spring, or last for much of the summer or even for more than one year "nWillows all have abundant watery bark sap, which is heavily charged with salicylic acid, soft, usually pliant, tough wood, slender branches, and large, fibrous roots. The roots are remarkable for their toughness, size, and tenacity to life, and roots readily sprout from aerial parts of the plant.