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 unfold, at maturity thin and firm in texture, light green above, pale below, 1½′—2′ long, about ½′—¾′ wide, on summer shoots, often 4′ long and 1½′ wide, with a slender yellow midrib, arcuate veins, and obscure reticulate veinlets; petioles thin, yellow, about ⅓′ long; stipules reniform, conspicuously veined, about 1/16′ broad. Flowers: aments densely flowered, glabrous, erect, often more or less curved, about 1½′ 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 spreading emarginate stigmas. Fruit ovoid, acuminate, light brown, about ⅛′ long; pedicels about ⅙′ 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, growing lighter colored in their second year. Winter-buds ovoid, rounded on the back, compressed and acute at the apex, bright orange color, about ⅛′ long. Distribution. Borders of streams and swamps; shores of Great Slave Lake southward through the region at the eastern base of the Rocky Mountains to Saskatchewan, northern Idaho, and northwestern Wyoming, and to western Nevada (Lake County; _M. S. Bebb_), and on the high Sierra Nevada in Calaveras and Mariposa Counties, California (_W. L. Jepson_). 16. Salix missouriensis Bebb. [Illustration: Fig. 150]