154 



TREES OF NORTH AMERICA 



acute and long-pointed, dark green, glabrous, with a short style and broad nearly sessile 

 stigmas. Fruit oblong-cylindric, light reddish brown, about \' long. 



A tree, 20-35 high, with a trunk 3'-7' in diameter, slender erect branches forming a 

 loose open head, and stout branchlets coated at first with hoary tomentum, bright yellow or 

 dark reddish brown and puberulous or pubescent during their first year, becoming darker 



Fig. 148 



and glabrous in their second season; or often at the north and at high altitudes a low shrub. 

 Winter-buds ovoid, acute, compressed, contracted laterally into thin wing-like margins, 

 light brownish yellow, glabrous or puberulous. Bark on young stems and on the branches 

 thin, smooth, light gray-brown, becoming on old trunks dark, about f ' thick, roughened 

 by small lenticels and broken into broad flat irregularly connected ridges. Wood light, 

 soft, close-grained, light brown, with thick nearly white sapwood; in southern California 

 often used as fuel. 



Distribution. Banks of streams in low moist ground; valley of the Klamath River, 

 California, southward along the foothills of the Sierra Nevada, the central valley, and on 

 the Coast Ranges to southern California; on Santa Catalina Island and on the mountains of 

 southern Arizona; on the Sierra de Laguna, Lower California; occasionally ascending 

 to altitudes of 4000 above the sea. 



15. Salix Mackenzieana Barr. 



Leaves lanceolate to oblanceolate, or elliptic, long-pointed at apex, cuneate or rounded 

 at base, finely crenately serrate, reddish and pilose with caducous pale hairs when they un- 

 fold, at maturity thin and firm in texture, light green above, pale below, If '-2' long, about 

 '-' wide, on summer shoots, often 4' long and If wide, with a slender yellow midrib, 

 arcuate veins, and obscure reticulate veinlets; petioles thin, yellow, about $' long; stipules 

 reniform, conspicuously veined, about T ^' broad. Flowers: aments densely .flowered, gla- 

 brous, erect, often more or less curved, about If long, terminal on short leafy branchlets; 

 scales oblanceolate, acute, dark-colored; stamens 2, with elongated free glabrous filaments; 

 ovary cylindric, long-stalked, elongated, gradually narrowed into a short style, with spread- 

 ing emarginate stigmas. Fruit ovoid, acuminate, light brown, about f ' long; pedicels 

 about ' in length. 



A small tree, with a slender trunk, upright branches forming a narrow shapely head, 

 and slender branchlets marked with scattered lenticels, glabrous or slightly puberulous 

 and often tinged with red when they first appear, soon becoming yellow and lustrous, grow- 

 ing lighter colored in their second year. Winter-buds ovoid, rounded on the back, com- 

 pressed and acute at the apex, bright orange color, about f long. 



