FOREST TREES. 145 
species, but its inferior size renders it less desirable 
for forest culture. Its foliage is thick, its flowers are 
numerous, of a beautiful rose-color, and are some- 
times produced twice in the season. They are not 
fragrant. Like the Common Locust, it is of rapid 
growth, produces numerous suckers from its roots, 
and is liable to the attacks of the same insect. It is * 
propagated like the preceding. 
Robinia hispida, the Rose Acacia, is a shrub com- 
monly cultivated for the beauty of its flowers. It is 
said to be increased in size by grafting on the other 
species. 
SALIX—WILLOW. 
Natural Order, Salicacee. 
Catkins, with the scales entire; sterile flowers of 
three to six stamens, with one or two small glands; 
pistillate flowers, with a small, flat gland at the base 
of the ovary on the inner side. 
There are many species of the Willow, and a con- 
siderable number are natives of the United States; 
but most of these are mere shrubs, and not one of 
them is applied to any useful purpose. A few foreign 
species have been introduced, possessing qualities 
which render them worthy of cultivation. All the 
Willows grow readily from cuttings, and are seldom 
propagated in any other way. 
1. Salix alba — White Willow. 
Leaves, lanceolate, pointed, toothed, covered with 
white, silky hairs, especially beneath; stipules, lance- 
olate; stigmas, nearly sessile, thick and recurved. 
138 
