10 Holm, The gcnus Carex in North -West America. 



Yukon Valley only, but is otherwise not uncommon in the middle 

 States extending southward to Colorado. The last of the Vigneae 

 is Ü. incurva, within the region only known from Alaska: Port 

 Clarence, St. Lawrence island, Muir Bay and the Chilkat Region. — 



In passing to the Melananthae C. alpina has been found at 

 a few stations in Alaska (Cape Nome, St. George island and Popof 

 islands) besides in Yukon and British Columbia. It occurs further- 

 more in the Rocky Mountains of Colorado, Montana and Wyoming 

 extending to the Hudson Bay Region ; but, so far, it has not been 

 found in the Atlantic States. Typical C. atrata does not occur in 

 Alaska, and seems to be rare in Yukon, British Columbia and Idaho; 

 it Grosses the continent, but without reaching the Atlantic coast, 

 where however C. ovata is quite widely distributed. A near ally 

 of C. atrata is C. chalciolepis, which Mr. Suksdorf has found on 

 Mt. Paddo (Adams) at an elevation of about 2,000 Met. ; this species 

 abounds in the Rocky Mountains of Montana, Wyoming, Utah and 

 Colorado. C. Mertensii is frequent in our region and ascends 

 from the sea-level to an altitude of until 2,000 Met. in the moun- 

 tains. Very rare is, on the other hand, C. Parryana, known only 

 from British Columbia; this species occurs furthermore in the prairie 

 region of Canada from Portage la Prairie to near the Athabasca 

 River; farther south it follows the Rocky Mountains to Colorado, 

 through Montana, Wyoming and Nebraska. C. styJosa, which also 

 occurs in South Greenland, does not seem to be rare in Alaska, 

 and has, also, been collected in Yukon ; a near ally of this is 

 (\ accedeyis, only known from Washington (Mt. Paddo and Mt. 

 Rainier) and Oregon (Sauvie's island). The western limit of 

 C. Baunoldsii is Mt. Paddo in Washington and Steins Mountains 

 in Oregon; the species is otherwise quite widely distributed east- 

 ward to North Dakota and south to Colorado. A very wide dis- 

 tribution is, however, exhibited by C. Buxhaumii, which crosses 

 the continent from the Pacific coast to the Atlantic, but is rather 

 rare in our region, in contrast to C. Gmelini, which abounds on 

 the Alaskan coast and islands. Among the formae desciscentes we 

 meet with C ustulata, very rare in our region, and on this con- 

 tinent, so far, only collected at Fort Conger in Grinnell Land and 

 near Hudson Bay ; but from there it extends to Greenland (the 

 west-coast), northern Europe and Asia. Near allies of this species 

 are C. venustula from British Columbia (Glacicr) and Alaska 

 (Chistachina River between Cook inlet and the Tanana River), and 

 C. Montatiensis from Yukon, Idaho and Montana. C. microcJiaefa 

 is only known from Yukon, C. sjjectabilis from several stations in 

 Washington, Oregon and British Columbia. 



In passing to the Microrhi/nchae our region possesses a large 

 number of species pertaining to various groups, and several of 

 these are only known from North -West America. It appears alto- 

 gether as if this region represents a most important center in regard 

 to distribution and development of this grex, at least judging from 

 the several more or less closely related species occurring together. 

 We find here C. vulgaris^ the type and some varieties, accom- 

 panied by C. Ihnnaea, hracliypoda and gymnodada from Washington 

 and Oregon. The widely distributed C. rig'tda occurs in Alaska 



