212 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Stigmas long and slender. 



Leaves canescent, becoming glabrate 3. iS. scssilifolia. 



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 6. S. exigua. 



Leaves green, glabrous, pale beneath, usually 



prominently serrate _ 4. S. melanopsis. 



Scales of the aments dark (pale in S. hehhiana); leaves ap- 

 pearing with or after the aments. 

 Capsules glabrous. 



Low shrub; leaves entire S. S. nn/rfilloides. 



Taller shrubs; leaves serrulate. 



Leaves not shiny above nor glaucous beneath, 



subcordate 9. S. cordata. 



Leaves glaucous beneatli, shining green above, 



not subcordate 10. 5. piperi. 



Capsules pubescent. 



Tall slirubs or trees, not alpine. 



Aments sessile, appearing with or before the 

 leaves. 



Scales black. 

 Style none. 



Capsule pubescent 11. S. scoulenana. 



Capsule tomentose \2. S. hookeriana. 



Style elongate 13. 5. hella. 



Scales pink or pale 14.5. hehbiana. 



Aments peduncled, appearing with the narrow 



leaves. 15. S. geyeriana. 



Low alpine shrubs. 



Stems erect, 1 to 2 meters high. 



Leaves glabrous above, glaucous beneath. 16. S. bardayi. 



Leaves pubescent on both sides 17. S. commutata. 



Stems prostrate. 



Leaves acute at each end 18. 5. ienera. 



Leaves obtuse, reticulate-veiny. 



Leaves 1 to 3cm. long, aments many- 

 flowered 19. S. saximontana. 



Leaves .5 to 1 cm. long, aments 3 to 



12-flowered 20. S. nivalis. 



1. Salix amygdaloides Anders. Proc. Am. Acad. 4: 53. 1858. 

 Type loc.xlity; " Fort Pierre, Missouri." 



Range: British Columbia to Quebec, southward to New York, Texas, and Oregon. 

 Specimens e.xamined: West Klickitat County, ^w/rsdor/", June 20 and 22, 1883: Yakima 

 County, Tweedy in 1882; Wawawai, Ptper 1932, 3591; Almota, Piper 1776. 

 Zonal distribution: Upper Sonoran. 



2. Salix lasiandra Benth. PI. Hartw. 335. 1857. 

 Salix lasiandra iyallii Sarg. Gard. & Forest 8: 463. 1895. 

 Salix iyallii Heller, Bull. Torr. Club 25: 580. 1898. 

 Type locality: "Ad flumen Sacramento," California. 

 Range: British Columbia to California. 



