THE WILLOWS. 67 
border it is a native. It has been found growing at a height of 
1300 feet in Northumberland. 
The Sallow {Salix caprea) is the only other species that can 
properly be considered as a tree, as it attains to a height of 
thirty feet, though fifteen to twenty feet is a more common 
Sallow. 
measurement. Its usually egg-shaped leaves vary from almost 
round to elliptical or lance-shaped, and from two to four 
inches in length. In the typical form, which occurs chiefly in 
woods, dry pastures, and hedgerows, they are broad, smooth, 
and dull-green above, covered with soft white down beneath ; 
the stipules half-kidney-shaped. This is the earliest of all our 
