Leaves linear-lanceolate, often somewhat falcate, gradually narrowed at the ends, long-pointed, dentate with small remote spreading callous glandular teeth, 2′—6′ long, ⅛′—⅓′ wide, when they unfold coated below with soft lustrous silky hairs, at maturity thin, glabrous, light yellow-green, darker on the upper than on the lower surface, with a yellow midrib, slender arcuate primary veins, and slender reticulate veinlets; petioles grooved, ⅛′—¼′ long; stipules ovate-lanceolate, foliaceous, about ¼′ long, deciduous. Flowers: aments cylindric on leafy branchlets, pubescent, the staminate about 1′ long, ⅓′ broad, terminal and axillary, the pistillate elongated, 2′ or 3′ long, about ¼′ broad; scales obovate-oblong, entire, erose or dentate above the middle, light yellow-green, densely villose on the outer surface, slightly hairy on the inner; stamens 2, with free filaments slightly hairy at the base; ovary oblong-cylindric, acute, short-stalked, glabrous or pubescent, with large sessile deeply lobed stigmas. Fruit light brown, glabrous or villose, about ¼′ long. A tree, usually about 20° high, with a trunk only a few inches in diameter, spreading by stoloniferous roots into broad thickets, short slender erect branches, and slender glabrous light or dark orange-colored or purplish red branchlets, growing darker after their first season; occasionally 60°—70° high, with a trunk 2° in diameter; often a shrub not more than 5°—6° tall. Winter-buds narrowly ovoid, acute, chestnut-brown, about ⅛′ long. Bark ⅛′—¼′ thick, smooth, dark brown slightly tinged with red and covered with small closely appressed irregularly shaped scales. Wood light, soft, light brown tinged with red, with thin light brown sapwood. Distribution. River banks, sand bars and alluvial flats; shores of Lake St. John, Quebec to Manitoba, and southward through western New England to northeastern Virginia, southern Ohio, Indiana and Illinois, western Kentucky, south Tennessee, to the mouth of the Mississippi River, and westward to southwestern South Dakota, southwestern Wyoming, northeastern Colorado, western Kansas and Oklahoma, and northern Texas. From central and northwestern Texas to northeastern Mexico and southern New Mexico represented by var. _angustissima_ Anders., differing in the absence of a dorsal gland in the male flowers and in the silky pubescence of the young ovary. In the northern Rocky Mountains region replaced by var. _pedunculata_ Anders., differing from the type in its narrower linear leaves, glabrous ovaries and longer pedicels of the fruit, and ranging from western South Dakota and northwestern Wyoming, through eastern Montana, Saskatchewan, and Alberta, to the valley of the Yukon River in the neighborhood of Dawson. A shrubby form with leaves densely covered with silky pubescence (var. _Wheeleri_ Schn.) is distributed from New Brunswick to North Dakota, Nebraska and Beckham County, Oklahoma. 14. Salix lasiolepis Benth. Arroyo Willow.