T. Holm — Studies in the Cyperacem. 303 



The species may be placed between C. variabilis and G. 

 lenticularis, although it shows some approach to C. acutina, 

 though merely in respect to its habit. We have examined a 

 number of specimens and are unable to refer the plant to 

 either of those mentioned above. 



Carex Nebraskensis Dew. 

 Habitually and in several other respects this species seems 

 inseparable from the Microi^hynchce, but we have placed it* as 

 one of the most e volute types of these on account of the biden- 

 tate beak of the perigynium. It is excellently described by 

 Boott,f and well marked by the strong stolons covered by 

 brown scale-like leaves, which are never shining, by the pale, 

 glaucous leaves and especially by the perigynium with its 

 prominent ribs and bidentate beak. In the extensive collec- 

 tion of Mr. Suksdorf we found several specimens, which were 

 somewhat like this species, ' but a careful examination of the 

 spikes convinced us that these could not safely be referred to 

 the species, nor ought they to be considered as simply varieties, 

 hence we prefer to describe them as two distinct species : C. 

 eurycarpa and C. oxycarpa. 



Carex euryearpa sp. n. (tigs. 9-10). 



Rhizome stoloniferous with persisting, brown leaf -sheaths 

 and strong roots ; leaves half as long as the culm, narrow (3 mm ), 

 carinate, light green, scabrous along the keel and margins ; 

 culm 60 cm in height, erect, slender but somewhat stiff, scabrous, 

 triangular, phyllopodic ; spikes 3 to 5, mostly 5, the terminal 

 and, sometimes, the uppermost lateral staminate, the others 

 purely pistillate, all remote ; the pistillate short-peduncled, 

 erect ; dense-flowered except towards the base, until 5 cm in 

 length, cylindric, but relatively thin, subtended by narrow, 

 sheathless bracts, about as long as the inflorescence ; scale of 

 staminate spike oblong, obtuse, light brown with pale midvein 

 and narrow, hyaline margins ; scale of pistillate spike lanceo- 

 late, acute, blackish with pale, not excurrent, midvein, nar- 

 rower, but about as long as the perigynium ; perigynium 

 sessile or nearly so, erect, roundish, granular, slightly plano- 

 convex, prominently many-nerved on both faces, brownish, the 

 beak short, emarginate ; stigmata 2. 



Washington : W. Klickitat County, Falcon Yalley, collected 

 by Mr. W. Suksdorf, June, 1886 (Nos. 1284 and 2962). 



Carex oxycarpa sp. n. (figs. 11-12). 

 Rhizome stoloniferous with strong roots and persisting, 

 brown leaf -sheaths ; leaves a little shorter than the culm, nar- 



* The author : Greges Caricum. (This Journal, vol. xvi, p. 457, 1903.) 

 f 111. gen. Carex, vol. iv, p. 175 and plate 592. 



