In this book are described three different Willows. The first is a lofty tree with a thick trunk and spreading branches; the second is usually a bushy mass of slender twigs bending over the river bed; and the third is a small creeping shrub which twines itself among the roots of the heather, and carpets the ground with masses of silky down. And I think if you know well these three kinds of Willow, you should be able to group the other members of the family around them. The White Willow (1) is the name given to the largest Willow tree, and very beautiful it is in early spring when the leaves unfold. It has a thick trunk covered with rough, rugged bark, and it sends out large branches, from which grow many smooth, slender twigs. The leaves (2) appear about the middle of May, long narrow leaves which taper to a point, and from a distance you would think that the edges were quite smooth. But when you pick a leaf you find that there are dainty little teeth cut all round the edge. These narrow leaves are covered on both sides with a silky grey down; this gives them a pale, silvery-grey colour, and from a distance you can easily recognise a White Willow tree by the glistening of this beautiful grey foliage, so different from the vivid young green of the Larch and the yellow-green of the Limes and Sycamores. The White Willow produces two kinds of flowers, and these grow in catkins on different trees. The stamen catkins are the prettiest, and they appear about the same time as the young leaves. At first these stamen catkins are small egg-shaped buds, closely covered with silky grey down--pussy buds (3) the children call them; but they open very quickly, and in a few days you will see, dropping from the branches, small green catkins which curl slightly like caterpillars. Each catkin is covered with closely-shut scales, and by the time the leaves are out the scales of these stamen catkins unclose (4). Behind each scale there rises a pair of stamens on long slender stalks. These stamen stalks are hairy on the lower half, and so are the catkin scales. The heads of the stamens are sometimes tinged with red, and between each pair of stamens there lies a honey bag. Notice how constantly the bees are heard buzzing among the Willow branches. When the stamen heads are ripe they burst open, and the fine dust inside is carried by the wind to a Willow tree, on which the seed catkins grow.