186 



10 to 30 feet high and 6 to 10 inches in diameter. The limber is soft, 

 light, and weak. 



Description. — Leaves lance-ovate, 2 to 4 inches long, ^ to 1 inch broad, margin 

 finely and sliarply toothed ; pale or whitish beneath; footstalks (petioles) -without 

 glands. 



79. — Salix lasiandra, Bentham. 



An important willow for commercial purposes, several well-marked 

 varieties of which having i^roved quite satisfactory osiers. Abundant 

 on banks of screams in Eocky Mountains of Colorado and northern 

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

 United States boundary). Generally more common and much larger 

 tree than the preceding, although the wood is not materially different; 

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

 diameter of 1^ feet or more. 



Description. — Leaves 1 to sometimes 6^ inches long, lanceolate, with long thin 

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

 on the under surface ; footstalks glandular at the upper end. The old 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. {Salix longifoUa^ Muhlenberg.) 



A small but widely-distributed species, occurring throughout the 

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

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

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

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

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

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



Description. — Leaves 3 to 4 inches long, -fV to | (commonly -^- to \) of an inch wide, 

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

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

 of this species occur, ^\hich ditfcr from the type chiefly in the form of the leaves and 

 pubescence. 



81. — [Salix flavescens^ Nuttall.) 



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

 found on the banks of streams 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. The 

 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 li inches wide, ov^atc or lance-shaped, 

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

 whitish or with yellowish-brown pubescence. 



