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



entirely misunderstood, the name erroneously applied to Dewey's 

 unpublished species : magnifica. The species (Sitchensis) shows 

 the same habit as C. acuta, but with the spikes constantly very 

 slender, long, peduncled and drooping; it has been collected 

 at several stations in Alaska, but is rare in Oregon and 

 Washington. An Inland type from the mountains of British 

 Columbia, Oregon and Washington and which comes very 

 near the former (Sitchensis) is C. dives; the spikes, however, 

 are of a lighter color and the perigynium is pale green with 

 scattered purplish spots and streaks, roundish in outline, 

 denticulate along the upper margins and with a short, entire beak; 

 it has, also, been found in California. 



While frequent in Montana, Dakota, Nebraska, Wyoming, 

 Colorado and Utah C. Nehrascensis seems to be rare in our region 

 and is absent from Alaska and Yukon ; in Washington it is accom- 

 panied by C. eurycarpa and oxycarpa, both of which possess 

 strongly ribbed perigynia with the beak emarginate and, in the 

 latter, with the margins denticulate. An ally of these is the more 

 evolute C. laciniata, a Californian type, which extends to Oregon; 

 in this species the perigynium is bidentate and the scales very 

 ofteh aristate. 



Among the ..formae desciscentes" C. scopulorum . so very 

 frequent in the Rocky Mountains, has also been found in Washing- 

 ton and Oregon, while the singular C. campi/locarpa is only known 

 from Oregon. 



As represented in North-West America the Microrhynchae 

 contain several interesting types, some of which are characteristic 

 of the region. And some of these correspond w'ell with old world, 

 especially European, types and are like these accompanied by 

 allies of habital resemblance, but with the squamae and perigynia 

 of different color and structure, We have seen that the old world 

 C. caespitosa has ahomologue in our C.prionophijna, that C. vulgaris 

 occupies the center of a group surrounded by such types as C. 

 limnaea, gyninoclada etc. ; the aquatilis-gvo\\'p with C. spjhacelata and 

 chionophila, the acutina- gro\x\) with C. Interrupta and limnocliaris^ 

 while the Nebrascensis-grow^ with C. eurycarpa and oxycarpa and the 

 still more evolute C. laciniata occupy the extreme limits of the 

 grex and have no homologues in Europe. 



Carices aeorastachyae. 



The salina-group is represented by C. sulispathacca and saluia 

 var. cuspidata, which have been collected on the Alaskan coast 

 and adjacent islands; they are, however rare in this region. A type 

 intermediate between these and the cryjjtoccnpa-group is the Alaskan 

 C. cryptochlacna from Seldovia and Kussiloff; it is a peculiar 

 species which resembles C. cryjjtocarpa so far as concerns the color 

 and shape of squamae and perigynia, but lacks its graceful habit, 

 the spikes being erect, nearly sessile and the leaves very broad. 

 — Very abundant is, on the other hand, C. cryptocarpa on the 

 Alaskan coast and islands extending to Washington, Oregon and 

 British Columbia, and is very variable. Another frequent and 

 truly north-western type is C. macrochaeta , which, also, abounds 



