( 264 ) 
Bracts fuscous, pee generally obtuse. 17. S. glaucops. 
Bracts yellow on 
Capsule nical 7-8 mm. long, grayish pubescent. 
18. S. glauca. 
Capsule ovate-conical, 5 mm. long, densely white- aie 
Leaves broadly obovate, obtuse, not turning black in drying. 
aghorne:. 
Leaves broadly oblanceolate, acute, turning black in drying. 
20 atra. 
roe narrowly oblanceolate, acute, slightly darkening in dry- 
ng. desertorum. 
Leaves sae iy pubescent, narrowly oblanceolate or lanceolate. 
g twigs densely clothed with long white vi saa hairs. 
. S. niphoclada. 
Young twigs finely villous-tomentose. 23. S. stricta 
Leaves broadly ovate, with white, villous, almost permanent hairs, ere 
ng in all directions. 24. S. Labradorica. 
y. SALIX POLARIS Wahl. Fl. Lapp. 261. 
This species is characterized by its slender but short 
branches, and by its thin, almost orbicular leaves, which are 
almost sessile, bright green and shining above. The capsules 
are moderately tomentose and the leaves very rarely indis- 
tinctly toothed. These latter characters separate it from S. 
herbacea, which it otherwise most resembles in general habit 
and the form and texture of the leaves. The habit is quite 
unlike that of the other species of the Arcticae group, but 
the structure of the pistil is the same. 
S. polaris is a European species. A single specimen, col- 
lected by james M. Macoun, in 1891, at Cape Vancouver, 
I cannot distinguish from the European form; its occur- 
rence there is exceedingly interesting. 
8. SALIx pipLopicTyA Traut. Nouv. Mem. Soc. Nat. Mosc. 
2: 307. S. Pallastt diplodictya Anders. in DC. Prod. 
167: 285. 
This is nearly related to S. arctica, and is generally re- 
garded as a variety of that species; but it differs in the 
shorter catkins and in the smaller and more rounded leaves, 
which are rather crowded and short petioled. The stem is 
less creeping than in .S. arctica and the branches shorter. 
The capsule is also generally shorter and less woolly. 
