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. fiUfolia extends 

 as far North as Yukon, besides that we have seen several speci- 

 mens from Washington, Oregon and Idaho; the species is more 

 characteristic of the Southern States, Colorado, California etc. 



Among the Sphaeridiophorae C. scirpoidea 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 Mountains 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. defleoca, a. species of 

 Vermont 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 hreinrosiris. A near 

 ally of this is C. globosa, only known from our region and California, 

 and the very rare C Wliitnetii formerly only collected at a few 

 stations in California (Mt. 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 Trichocarpae me meet here with the common 

 C. filiformis and the equally abundant C. lanuginosa. Of C. tricho- 

 carpa, so very frequent in the East, we have only 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. Oregoneiisls, 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 Fräser 

 River (British Columbia) and from the Blue Mountains and banks 

 of Snake River (Oregon). C. capiUaris 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 

 Mountains 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 shorc of James' Ba\- in the region of Hudson Bay, besides 



