186 



10 to 30 feet high and C to 10 inches in diameter. The timber is soft, 

 light, and weak. 



Descri})iion. — Leaves lance-ovate, '2 to 4 inches long, to 1 inch broad, maruin 

 finely and sharply toothed ; pale or whitish hcneath; footstalks (x)etioles) without 

 glands. 



79. — Salix lasianclra, Bentham. 



An important willow for commercial purposes, several well-marked 

 varieties of which having proved quite satisfactory osiers. Abandant 

 on banks of srreams in Rocky Mountains of Colorado and northern 

 New Mexico (ou the Pacific coast from central California to and north 

 United States boundary). Generally more common and much larger 

 tree than the preceding, althongh the wood is not materially difterent; 

 in favorable localities it reaches a height of from 25 to 60 feet, with a 

 ■ diameter of 1^ feet or more. 



Descripiloii. — Leaves 1 to sometimes G^- inches long, lanceolate, with long thin 

 point, finely and sharply toothed on the margin; smooth above, pale or whitish 

 on the nnder snrface ; footstalks glandular at the upper end. The ohl bark is rather 

 strongly furrowed, and is of a grayish or brownish color; the young branches are 

 glossy yellow, and in habit not unlike the Weeping Willow. 



80. — Sand-bar Willow. (Sallv longifoUa, Muhlenberg.) 



A small but widely-distributed species, occurring thrpughout the 

 Rocky Mountain region (also in eastern United States and in the Pa- 

 cific States). It is commonly found growing on the moist banks of 

 streams aud on sand-bars, in some cases forming thick growths. In 

 the central Pacific coast region it is said to attain its greatest develoj)- 

 ment, but it is a smnli tree, rarely more than 25 to 30 feet high and J to 

 1 foot in diameter. The wood is light and soft. 



Descripiion. — Leaves 3 to 4 inches long, -p/ to | (commonly i to 4) of an inch wide, 

 linear to lance-shaped, long-pointed, tapering at the base, sessile or with short stems; 

 margin entire, or with very small somewhat distant teeth. — Two or three varieties 

 of this species occur, ^\hich differ from the type chielly in the form of the leaves and 

 pubescence. 



SI.— {Salix\flavescens, ISTuttall.) 



A tree of 20 to 25 feet in height and G inches to 1 foot in diameter, 

 fonnd on the banks of streauis in the mountains from New Mexico to 

 Montana and Idaho (also occurring in central Pacific coast region.) It 

 reaches its largest size in the southern Rocky Mountain region. Tlie 

 wood is light and lacking in strength; a variety of this species, called 

 the Black Willow, and confined to the Pacific coast, has tough, strong- 

 wood. 



Description. — Leaves 2 to 3 inches long, 1 to 1^ inches wide, ovate or lance-shaped, 

 tapering at the base; with age becoming smooth and a dull green above, below 

 whitish or with yellowish-brown pubescence. 



