T. Holm — Studies in the Cyperaeece. 139 



1 staminate spike in 50 specimens. 



n (< a a -| -j a 



3 pistillate " "33 



2 " " " 26 " 



The relative length of the staminate and pistillate scale, 

 and the perigyninm varies considerably even in the same 

 spike, when examined from base to apex. For instance, 

 in the typical plant we measured these organs, and the 

 length of the staminate scale was 10 mm., including the 

 arista, 3 mm. ; in the same specimens the length of the 

 pistillate scale was 8.5 mm. including the arista, 3.5 

 mm. ; the length of the mature perigyninm was 5 mm., and 

 the width 2.5 mm. But in some specimens from 

 Unalaska of which the spikes were exceptionally thick 

 and heavy, the following measures were observed: The 

 staminate scale was 19 mm. in length, including the 

 arista, 8 mm. ; the length of the pistillate scale, from 

 near the base of the spike, was 23 mm., including the 

 arista, 10 mm. ; at the middle of the same spike the pis- 

 tillate scale measured 20 mm., including the arista, 

 10 mm. 



We have described two varieties: emarginata (figs. 

 4-6) from Alaska: Kukak Bay, and macro chlcena (fig. 

 7-9) from St. Paul Island, Bering Sea, 3 Of these the 

 latter possesses remarkably large perigynia, measuring 

 7 mm. in length, and 3 mm. in width, while the subtending 

 squama measured only 6 mm. in length, including the 

 arista, 1.5 mm. 



Typical C. macrochceta is widely distributed on the 

 coast of Alaska, extending to Yukon, "Washington and 

 Oregon; it occurs on the Asiatic coast: St. Lawrence 

 Bay, Kamtschatka and Sachalin. A near ally of C. 

 macrochmta is: 



C. flavocuspis. 



Franchet has redescribed the species 4 and the diagnosis 

 reads as follows : 



3 This Journal, vol. 17, p. 314, 1904. 



4 Les Carex de l'Asie orientale (Xouv Arch. Mus. d 'hist, naturelle, ser. TIT, 

 vol. 9, p. 143, Paris, 1897). 



