212 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Stigmas long and slender. 
Leaves canescent, becoming glabrate............- 3. S. sessilifolia. 
Leaves silvery-velvety on both sides.........-.--- 7. S. macrostachya. 
Stigmas short and thick. 
Capsules pubescent..........-...-....---.-----.. 5. S. argophylla. 
Capsules glabrous. 
Leaves canescent, at least when young, entire 
or denticulate....-. 2... 2. --------------- 6. S. ecigua. 
Leaves green, glabrous, pale beneath, usually 
prominently serrate..................-.--- 4. 8. melanopsis. 
Scales of the aments dark (pale in S. bebbiana); leaves ap- 
pearing with or after the aments. 
Capsules glabrous. 
Low shrub; leaves entire...............-------- 8. S. myrtilloides. 
Taller shrubs; leaves serrulate. 
Leaves not shiny above nor glaucous beneath, 
subcordate..... 2.222222 2222 ee ee eee ee 9. S. cordata. 
Leaves glaucous beneath, shining green above, 
not subcordate. .... 2.222.222 22-22-22 --- 10. S. piperi. 
Capsules pubescent. 
Tall shrubs or trees, not alpine. 
Aments sessile, appearing with or before the 
leaves. 
Scales black. 
Style none. 
Capsule pubescent. ...........- 11. 8. scouleriana. 
Capsule tomentose. .........-.- 12. 8S. hookeriana. 
Style elongate... ....2.2..2.2-.-.- 13. S. bella. 
Scales pink or pale...... 2.2. 2.22-2----- 14. S. bebbiana. 
Aments peduncled, appearing with the narrow ~ 
leaves... 2-2-2222 2 eee 15. 8. geyeriana. 
Low alpine shrubs. 
Stems erect, 1 to 2 meters high. 
Leaves glabrous above, glaucous beneath. 16. S. barclayi. 
Leaves pubescent on both sides. ......... 17. S. commutata. 
Stems prostrate. 
Leaves acute at each end... -. 2-2... - 18. S. tenera. 
Leaves obtuse, reticulate-veiny. 
Leaves | to 3cm. long, aments many- 
flowered. ..........-2-2--------- 19. S. saximontana. 
Leaves .5 to 1 em. long, aments 3 to 
12-flowered......2.2..-2---.----- 20. S. nivalis. 
1. Salix amygdaloides Anders. Proc. Am. Acad. 4: 53. 1858. 
Type Locatity: ‘ Fort Pierre, Missouri.” 
RANGE: British Columbia to Quebec, southward to New York, Texas, and Oregon. 
SPECIMENS EXAMINED: West Klickitat County, Suksdorf, June 20 and 22, 1883; Yakima 
County, Tweedy in 1882; Wawawai, Piper 1932, 3591; Almota, Piper 1776. 
ZONAL DISTRIBUTION: Upper Sonoran. 
2. Salix lasiandra Benth. Pl. Hartw. 335. 1857. 
Salix lasiandra lyallii Sarg. Gard. & Forest 8: 463. 1895. 
Salix lyallii Heller, Bull. Torr. Club 25: 580. 1898. 
Type Loca.ity: ‘ Ad flumen Sacramento,” California. 
RanGeE: British Columbia to California. 
