158 



TREES OF NORTH AMERICA 



hairs persistent on the mature leaves, entire, often somewhat wrinkled, dull yellow-green 

 above, 2'-4' long, l'-lf wide, with a broad yellow midrib; stipules linear-lanceolate to fili- 

 form, entire, '-f long, usually persistent until midsummer. Flowers: aments appearing 

 in June when the leaves are nearly fully grown, stout, erect, tomentose, stalked, on leafy 

 branchlets, the staminate l'-l?' long, much shorter than the pistillate; scales oblong- 

 ovate, rounded at apex, dark-colored, and coated with long silvery white soft hairs; 

 stamens 2, with slender elongated filaments; ovary acuminate, short-stalked, covered with 

 soft pale hairs, gradually narrowed into the elongated slender style, with 2-lobed stigmas. 

 Fruit nearly sessile, ovoid, acuminate covered with close dense pale tomentum, j' long. 

 A tree, sometimes 30 high, with a trunk 4'-6' in diameter, and stout branchlets thickly 



Fig. 153 



coated at first with matted white hairs, becoming in their second year glabrous, dark 

 purple, lustrous, marked by large elevated pale scattered lenticels and much roughened by 

 large U-shaped leaf-scars; often shrubby, and in the most exposed situations frequently 

 only a foot or two high, with semiprostrate stems. 



Distribution. Coast of Alaska from the Alexander Archipelago to Cape Lisbourne, and 

 eastward to the valley of the Mackenzie River and to the shores of Coronation Gulf; the 

 only arborescent Willow in the coast region west and north of Kadiak Island; attaining its 

 largest size from the Shumagin Islands eastward. 



20. Salix Bebbiana Sarg. 



Leaves oblong-obovate to oblong-elliptic or lanceolate, acuminate and short-pointed or 

 acute at apex, gradually narrowed and cuneate or rounded at base, remotely and irregularly 

 serrate usually only above the middle, or rarely entire, when they unfold pale gray-green, 

 glabrous or villose, and often tinged with red on the upper surface and coated on the lower 

 with pale tomentum or pubescence, at maturity thick and firm, dull green and glabrous 

 or puberulous above, blue or silvery white and covered with pale rufous pubescence below, 

 especially along the midrib, veins, and conspicuous reticulate veinlets, l'-3' long, |'-1' 

 wide; petioles slender, often pubescent, reddish, i'-|' long; stipules foliaceous, semicordate, 

 glandular-dentate, sometimes nearly \' long on vigorous shoots, deciduous. Flowers: 

 aments terminal on short leafy branchlets; scales ovate or oblong, rounded at apex, broader 

 on the staminate than on the pistillate plant, yellow below, rose color at apex, villose with 

 long pale silky hairs, persistent under the fruit; staminate aments cyhndric, obovoid, nar- 

 rowed at base, densely flowered, f'-l' long, \'-\' thick; pistillate aments oblong-cylindric, 

 loosely flowered, l'-l|' long, \' thick; stamens 2, with free glabrous filaments; ovary 



