G.92] 



CLASSIFICATION AND DESCRIPTION 



167 



long, the capsules very hairy, with short 

 but distinct style. A very variable spe- 

 cies, common in low meadows and on river- 

 banks; usually a shrub, but occasionally 

 15 ft. high. 



13. Salix cindrea, L. (GRAY OR ASH- 

 COLORED WILLOW. ) Leaves obovate-lan- 

 ceolate, entire to serrate ; glaucous-downy 

 and reticulated with veins beneath; sti- 



pules half heart-shaped, serrate. Flow- 

 ers yellow; ovary silky, on a stalk half as 

 long as the bracts. A shrub to middle- 

 sized tree, 10 to 30 ft. high, with an 

 erect trunk; occasionally cultivated ; from 

 Europe. 



14. Salix longifolia, Miihl. (LONG- 

 LEAVED WILLOW.) Leaves linear-lanceo- 

 late, very long, tapering at each end, 

 nearly sessile, remotely notched with pro- 

 jecting teeth, clothed with gray hairs when 

 young; stipules small, lanceolate, toothed. 

 Branches brittle at base. A shrub or 

 small tree, 2 to 20 ft. high, common, es- 

 pecially westward, along river-banks. 



8. longifolia. 



GENUS 92. POPTJLUS. 



Trees with alternate, deciduous, broad-based leaves. 

 Flowers in long and drooping catkins, appearing before 

 the leaves are expanded in the spring. Fruit small, dry 

 pods in catkins, having seeds, coated with cottony down, 

 which early in the season escape and float in the wind. 

 On this account the trees are called Cottonwoods in the 

 West. Trees with light-colored, rather soft wood. 



* Leaves always white-hairy underneath ; more or less deeply 



lobed ; buds not gummy 1. 



* Leaves smooth beneath, at least when old. (A.) 

 A. Leafstalk decidedly flattened laterally. (B.) 



B, Buds not covered with sticky gum. (C.) 



