The above are all foreign sorts, which, however (except the last), have long ago been introduced, and are now quite common in the United States. All of them except the first, have an upright or wavy, spreading growth, and form lofty trees, considerably valued abroad for their timber. The White willow and the Russell willow are very rapid in their growth, and have a pleasing light green foliage. The Golden willow is remarkable for its bright yellow bark, which renders it quite ornamental, even in winter. It is a middle sized tree, and is often seen growing along the road-sides in the eastern and middle states. Salix caprea is deserving a place in collections for the beauty of its abundant blossoms at an early and cheerless period in the spring. There are a number of other species found growing in different parts of the Union, which may perhaps possess sufficient interest to recommend themselves to the planter.