52 BOTANICAL GAZETTE [JULY 
SALIX FLUVIATILIS (?) Nuttall, N.A. Sylva 1:73. 1842 (fig. 3). 
S. sessilifolia of various authors, as Sargent, Silva N.A. 9:127. pl. 475. 
1896; Rowlee, N.A. Willows. I. Longifoliae Bull. Torr. Bot. Club 27:250. 
pl. g. fig. 8. 1900; Howell, Fl. N.W. U.S. 618.1903; not of Nuttall, N.A. 
Sylva 1:68. 1842. 
Shrub, 2-6 and probably 8 m. in height; branchlets slender, 
brown, longitudinally striated (probably from shrinking in drying), 
glabrous, those of the season yellowish, often pubescent. 
Leaves subsessile or the larger distinctly petiolate, stipulate on 
young shoots; stipules ovate to lanceolate, 2-6 mm. long, sparingly 
denticulate; petioles becoming 5-8 mm. long on the large leaves 
subtending branchlets, mostly pubescent; blades very narrowly 
elliptical or linear-lanceolate or those on fruiting branchlets nar- 
rowly oblanceolate, acute or short acuminate at the very sharp or 
spinulose apex, acute or short acuminate at the base, narrowing to 
the very short petiole, 5-7 cm. long, 8-14 mm. wide, the subtending 
leaves much larger, 8-10 cm. long, 15-20 mm. wide, all closely to 
remotely and more or less spinulosely denticulate, especially near 
the apex; thinly pubescent, becoming glabrate, the young leaves 
often silvery silky-villous, finally almost glabrous, green above, 
paler or occasionally slightly glaucescent beneath. 
Aments appearing after the leaves, usually clustered, one ter- 
minal and 2-5 younger lateral at the ends of leafy branchlets 
5-10 cm. long; pistillate aments 3-7 cm. long, 10-15 mm. wide; 
ovary silvery villous; capsule lanceolate, 5-7 mm. long, brown, 
villous to thinly villous to glabrate or wholly glabrous in age; style 
and stigmas together about 1-1.5 mm. long (difficult to determine 
how much is style), style divided usually to the base, stigmas also 
divided to the base, scales lanceolate or elliptical, 2.5—3.5 mm. 
long, sometimes shallowly erose-dentate at the apex, yellow, 3-5- 
striate, thinly pubescent when expanding to glabrate or glabrous 
in age (obovate before anthesis). 
Staminate aments clustered as the pistillate, 4-5 cm. long; 
scales as in the pistillate ament; stamens 2; filaments densely 
pubescent below and thinly so toward the apex, anthers about 1 mm. 
long. 
