Description
Willows all have abundant watery bark sap, which is heavily charged with salicylic acid, soft usually pliant tough wood, slender branches and large fibrous often stoloniferous roots. The roots are remarkable for their toughness, size, and tenacity to life, and roots readily grow from aerial parts of the plant.
The leaves are typically elongated, but may also be round to oval, frequently with a serrated margin. Most species are deciduous; semievergreen willows; coriaceous leaves are rare, e.g. Salix micans and S. australior in the eastern Mediterranean. All the buds are lateral; no absolutely terminal bud is ever formed. The buds are covered by a single scale, enclosing at its base two minute, opposite buds, alternately arranged, with two small, opposite, scale-like leaves. This first pair soon falls, and the later leaves are alternately arranged. The leaves are simple, feather-veined, and typically linear-lanceolate. Usually they are serrate, rounded at base, acute or acuminate. The leaf petioles are short, the stipules often very conspicuous, look like tiny, round leaves and sometimes remain for half the summer. On some species, however, they are small, inconspicuous, and fugacious (soon falling). In color, the leaves show a great variety of greens, ranging from yellowish to bluish.
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