434 



CYPERACEAE. 



VOL. I. 



221. Carex rotundata Wahl. Round-fruited 



Fig. 1088. 



Sedge. 



C. rotundata Wahl. Vet.-Acad. Handl. 24: 153. 1803, 



Culms slender but stiff, obtusely triangular, 

 smooth below inflorescence, not filamentose at base, 

 6'-i3 tall, caespitose but stoloniferous. Leaves li" 

 wide or less, strongly involute, usually exceeding the 

 culm, not strongly nodulose, somewhat roughened 

 towards apex, the lowest bract short, strongly ex- 

 ceeded by culm, usually widely divergent; staminate 

 spikes 1-2, short-stalked ; pistillate spikes 1-2, 

 ascending, oblong, s"-g" long, 4"-s" wide, sessile 

 or very short-stalked ; perigynia squarrose-spreading, 

 dark-tinged, obsoletely nerved, broadly ovoid, in- 

 flated, 2"-3" long, abruptly contracted into a short 

 minutely 2-toothed beak; scales ovate, acute, nar- 

 rower and shorter than perigynia, dark-tinged; 

 stigmas 3. 



Arctic America and Greenland, 

 rope and Asia. July-Aug. 



Also in northern Eu- 



222. Carex membranopacta Bailey. Fragile 

 Sedge. Fig. 1089. 



Carex compacta R. Br. in Ross' Voy. App. cxliii. 1819. 



Not Krock. 1814. 



Carex mcmbranacea Hook. Parry's 2d Voy. App. 406. 

 ^ 1825. Not Hoppe. 

 C. membranopacta Bailey, Bull. Torr. Club 20 : 428. 1893. . 



Similar to the last, short-stoloniferous, the culms 

 caespitose, 6'-i8' high. Leaves flat, not exceeding 

 the culm, \V'-2\" wide, the margin revolute ; bracts 

 short, the lower commonly longer than its spike, the 

 upper subulate ; staminate spikes 1-3, short-stalked ; 

 pistillate spikes 1-3 (commonly 2), 'sessile or the 

 lower short-peduncled, approximate, narrowly ob- 

 long, densely 25-75-flowered, 6"-is" long, 4" in diam- 

 eter; perigynia spreading, dark-tinged, broadly oval 

 to obovoid, fragile, much inflated, about 2" long and 

 i" wide, tipped with a short minutely bidentate beak, 

 little-nerved, rather longer than the ovate-oblong, 

 brownish, hyaline-margined scales ; stigmas usually 3. 



Greenland and north Labrador to Alaska. Summer. 



223. Carex rostrata Stokes. Beaked Sedge. 

 Fig. 1090. 



C. utriculata Boott ; Hook. Fl. Bor. Am. 2: 221. 1840. 

 C. rostrata Stokes ; With. Arrang. Brit. PI. 2 : 1059. 1787. 



Glabrous, culms stout, erect, i-4 tall, thick at 

 base, generally obtusely angled and smooth above. 

 Leaves elongated, strongly nodulose, the upper 

 mostly exceeding the culm, i"-6" wide, the midvein 

 prominent ; bracts overtopping the culm ; staminate 

 spikes 2-4, linear, stalked, the lower occasionally 

 pistillate at the top and usually subtended by a very 

 slender bract ; pistillate spikes mostly 2 to 4, nearly 

 erect, cylindric, densely many-flowered, the peri- 

 gynia in many rows, or sometimes looser near the 

 base, 2'-6' long, 3"-io" thick, the lower short- 

 stalked, the upper sessile, sometimes staminate at 

 the summit; perigynia spreading when old, ovoid, 

 light green, somewhat inflated, few-nerved, 2"-4" 

 long, abruptly contracted into a short 2-topthed 

 beak; scales lanceolate, the lower awned and slightly 

 longer than the perigynia, the upper acute; stigmas 3. 



Marshes, Labrador to British Columbia, Delaware, Ohio and California. Also in Europe and 

 Asia. June-Sept. 



