(276) 
with which it could scarcely be confused. It is much nearer 
related to S. phlebophylla, from which it differs mainly in the 
longer petioles and styles. 
Auaska: Silver Bow Basin, above Juneau, 1891, Grace 
Cooley (in the Columbia Herbarium). 
29. Satix Woxri Bebb, Bot. Wheeler Exp. 241; Salix 
desertorum Wolfid Bebb, in Coulter, Man. R. M. 338. 
This has been placed in this group on account of its glab- 
rate capsule. It is true that at first it is somewhat puberulent, 
but that is also the case in S. phlebophylla and probably in 
all the species of the group. It resembles somewhat .S. des- 
ertorum in habit, but cannot be regarded as a form of that 
species. In the form of the leaves it resembles more S. 
glaucops. Jt grows in alpine regions of the Rockies. 
Cotorapo: South Park, 1873, /. Wolf; Gray’s Peak, 
1872, Torrey. 
Wyromine: Big Horn Mountains, 1898, Tweedy. 
YELLOWSTONE Park: 1886, Tweedy, wo. g8z ; 1884, 20. 35. 
RETUSAE. 
Very small, depressed cespitose willows, at most only a 
few cm. high, with very small leaves, less than 5 mm. long 
and with entire margins; catkin few- (in ours 2-4-) flow- 
ered; capsule glabrous with an almost sessile style. 
Leaves orbicular, often retuse. 30. S. rotundifolia. 
Leaves oblong-elliptic. 31. S. Dodgeana. 
30. SALIX ROTUNDIFOLIA Trautv. Nouv. Mem. Acad. Mosc. 
2: 304. 1832. 
It is characterized by its small nearly orbicular leaves, 
less than 5 mm. long, which are generally subcordate at the 
base and retuse at the apex, by its 2-4-flowered catkins, gla~ 
brous capsule and almost sessile style. 
Auaska: Unalaska, 1891, J. AL. Macoun, nos. 139, 213 
and (78885); Point Barrow, Murdock, no. 24; Attu Island, 
1879, L. Al. Turner, no. 1293, in part. 
Benrinc StTrair and ARAKAMTCHATCHENE ISLAND: 
1853-6, C. Wright. 
