SALICACEAE. 
17. Salix petiolaris J. E. Smith. 
Slender Willow. (Fig. 1189.) 
Salix petiolaris J. E. Smith, Trans. Linn. Soc. 6: 
122. 1802. 
A shrub, similar to the preceding species, but 
the young leaves only slightly silky, the 
branches slender, upright or ascending. Ma- 
ture leaves lanceolate, acuminate at both ends, 
serrulate with blunt cartilaginous teeth, remain- 
ing green in drying, 4’’-8’’ wide; petioles 2//-5’’ 
long; stipules deciduous; aments expanding be- 
fore the leaves, the pistillate short-peduncled, 
usually rather loose, about 1’ long ih fruit; sta- 
mens 2; filaments glabrous; stigmas nearly ses- 
sile; capsule tapering from an ovoid or oblong 
base, pubescent, 2’’-3’’ long, about twice as 
long as the filiform pedicel. 
In swamps, New Brunswick to the Northwest 
‘Territory, south to Tennessee and Michigan. May. 
Salix petiolaris gracilis Anders. in DC. Prodr. 16: Part 2, 235. 1868. 
Salix gracilis Anders. Proc. Am. Acad. 4:67. 1858. 
Pedicels nearly as long as the capsules; leaves rather narrower. Range undetermined. 
18. Salix argyrocarpa Anders. Silver 
Willow. (Fig. 1190.) 
S. argyrocarpa Anders. Mon, Sal. 107. f. 60. 1867. 
An erect or diffuse shrub, 6’—2° high, the twigs 
dark green, nearly terete, shining. Leaves ob- 
long or oblanceolate, acute at each end or the 
lower obtuse, short-petioled, entire or crenu- 
late, bright green and glabrous above, persist- 
ently silvery-silky beneath, 1/-2’ long, 3//-6/’ 
wide, the margins slightly revolute; aments un- 
folding with the leaves, leafy-bracted at the base, 
dense, 1’ or less long; scales persistent, villous; 
stamens 2, distinct, their filaments glabrous; 
style slender, longer than the stigmas; capsule 
oblong-conic, densely silvery, acute, 1//-114// 
long, about twice as long as its pedicel. 
Labrador and Quebec to the White Mountains of 
New Hampshire. Hybridizes with S. piylictfolia. | 
June-July. \\ { 
1g. Salix desertorum Richards. Desert 
Willow. (Fig. 1191.) 
Salix desertorum Richards. Frank. Journ. App. 
371. 1823. 
A shrub, 6’-12’ high, with purplish-green 
twigs. Leaves oblong or oblanceolate, acute at 
the apex and cuneate at the base or the lower 
obtuse at both ends, entire or very nearly so, 
very short-petioled, tomentose on both sides or 
glabrate above when old, 34’-2’ long, 2//-4’’ 
wide; stipules fugacious; aments expanding with 
the leaves, dense, 14’ or less long, leafy-bracted 
at the base; stamens 2; filaments glabrous; style 
about as long as the deeply 2-cleft stigmas; 
capsule ovoid-conic, acute, densely tomentose, 
about 2’ long, very short-pedicelled. 
Anticosti and Quebec to western arctic America, 
south along the Rocky Mountains to Colorado. 
Suniumer, 
