Holm, The genus Carex in North-West America. 
13 
in most of the Canadian provinces and in the Eastern and some of 
the central United States, it occurs within our region only in 
British Columbia. It is interesting to see that C. filifolia extends 
as far North as Yukon, besides that we have seen several speci- 
mens froin Washington, Oregon and Idaho; the species is more 
characteristic of the Southern States, Colorado, California etc. 
Among the Sphaeridiophorae C. scirpoülea has been found at 
several stations in Alaska: Chilkat Region, Juneau, Cape Nome, 
St. Lawrence island, Yes Bay and Port Clarence, besides in Yukon 
and British Columbia, sometimes accompanied by the var. steno- 
chlaena. The species is not infrequent in the mountains of Canada, 
besides that it occurs, also, in the Rocky jMountains of Colorado, 
extending North to Montana and Wyoming, East to New England, 
the Hudson Bay Region etc. In Washington it follows the Olympic 
and Cascade Mountains at high elevations. C. Rossii has not yet 
been found in Alaska, but it is common in Washington and 
British Columbia; it is rather infrequent in Oregon, Yukon and 
Idaho, extending from there to Montana, Wyoming, Colorado and 
Utah, and has often been mistaken for C. deflexa, a species of 
Y"ermont and the coast of Greenland. C. umbellata so characteristic 
of the Eastern States occurs, also, in our region, but is very 
rare, however; it is accompanied by the variety hrevirosfris. A near 
ally of this is C. globosa, only known from our region and California, 
and the very rare C. IMiitneifi formerly only collected at a few 
stations in California (IMt. Shasta, Yosemite Valley and Lassen 
County) has lately been discovered in Oregon: near Lake of the 
woods in Klamath County. The grex is, thus, sparingly represented 
in North-West America, but is, as we know, very characteristic 
of the Eastern States extending as far south as subtropical Florida. 
In examining the Tricliocarpae me meet here with the common 
C. filifonnis and the equally abundant C. lanugmosa. Of C. tr'icho- 
carpa^ so very frequent in the East, we have onty seen a few 
specimens from Idaho, while its near ally C. aristata has been 
collected in Washington and Oregon, but seems to be very rare; 
otherwise this species is quite abundant through Montana, Wyoming, 
Nebraska and the Dakotas extending to the Atlantic coast, New 
England. C. Oregonensis, first collected in Oregon, is known now 
from Washington: Mt. Adams, dry meadows,. Skamania County. 
The large grex Hymenochlaenae is very poorly represented. 
C. Backii, which is not uncommon in the eastern and central 
portion of this continent is, on the other hand, exceedingly rare 
in our region, so far only known from the valley of the Fraser 
River (British Columbia) and from the Blue IMountains and banks 
of Snake River (Oregon). C. capillaris is, also, rare and has only 
been collected at a very few stations in Alaska, Yukon, British 
Columbia and Idaho, while it is widely distributed along the Rocky 
IMountains through Colorado, Montana and Wyoming eastward to 
Newfoundland and the White Mountains. In Alaska it is accom¬ 
panied by C. Krausei, in Yukon by C. WiUiamsii] of these the 
former has been found at Muir Glacier and in the Chilkat Region, 
the latter at Dawson. C. Williamsii has, furthermore, been collected 
on the shore of James’ Bay in the region of Hudson Bay, besides 
