The Silver - leaved Willow (Salix sessilifolia, Nutt.), with scarcely any stem for its narrow silky-lined leaves, is a little tree that follows stream borders from Puget Sound south to the western slopes of the Sierra Nevada. It is one of the commonest willows of the coast region of southern California. The hoary tomentum that clothes the opening leaves is never quite lost from the under sides of the leaves. They are pale yellow-green on the upper sides at maturity.