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1. Sauix vestTirA Pursh, Fl. Am. Sept. 610. 
This species differs from the others not only by the pres- 
ence of the long silky hairs on the lower surface of the 
leaves, but also by the fact that it often forms a shrub several 
decimeters high. Its range extends from Labrador to the 
Rocky Mountains. 
Lasprapor: Butler; 1892, A. C. Waghorne, nos. 2 and 
3, 1893. 
Lower Canapa: Table Top Mountain, 1881, /. A. Allen. 
Canapian Rocky Mountains: Drummond; Herb. 
Hooker, Barratt & Torrey, nos. 83 & 84. 
Montana: Old Marias Pass, Sargent & Canby; 1883, 
Canby, no. 292; McDonald’s Peak, zo. 291. 
2, SALIX ORBICULARIS Anders. DC. Prod. 167: 300. 
Most specimens labeled Salix reticulata from sub-arctic 
and arctic America belong to this species. The typical form 
has nearly orbicular leaves, somewhat cordate at the base. 
This form is well represented by specimens collected by J. 
M. Macoun on St. Paul Island in 1897 (Herb. Geol. Surv. 
Canada, no. 18875). The form of the leaves is, how- 
ever, very variable. Elongated elliptic leaves, resembling 
those of SS. reticulata, are notat alluncommon. Thetwocan- 
not be distinguished by the leaves. In S. ordzcularis, the 
bracts are broadly obovate, fuscous, z. e., dark brown or 
dark purplish, glabrous on the lower surface, except the 
margin and the base, and the capsule is larger than in S. 
reticulata, and comparatively little pubescent with short 
fine hairs, while in S. re¢écudata it is densely woolly. Its 
range extends from Labrador to British Columbia and Alaska. 
I have seen numerous specimens. 
3. SALIX RETICULATA L. Sp. Pl. 1018. 
Of the typical European form with elongated catkins and 
oblong yellow bracts, which are densely woolly, especially 
at the base, I have seen no good specimens from North 
America. The only specimens that I have seen and which 
may be referred to S. ret7culata are the following : One 
