G. 92} CLASSIFICATION AND DESCRIPTION I67 
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. 
18. Salix cinérea, L. (GRay oR ASH- ANS 
COLORED WILLOW.) Leaves obovate-lan- 1 
ceolate, entire to serrate; glaucous-downy 2 
and reticulated with veins beneath; sti- 8. cinérea, 
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. (Lone- 
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 
1 young; stipules small, lanceolate, toothed. 
7 Branches brittle at base. A shrub or 
=> small tree, 2 to 20 ft. high, common, es- 
8. longifolia, pecially westward, along river-banks. 
> Genus 92. POPULUS.. 
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 .... 6. 6.1... . cece eee eee 1. 
* Leaves smooth beneath, at least when old. (A.) 
A. Leafstalk decidedly flattened laterally. (B.) 
B, Buds not covered with sticky gum. (C.) 
