434 



CYPERACEAE. 



VOL. I. 



221. Carex rotundata Wahl. Round-fruited 

 Sedge. Fig. 1088. 



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



Culms slender but stiff, obtusely triangular, 

 smooth below inflorescence, not filamentose at base, 

 6'-i$ 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"~5" 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. Also in northern Eu- 

 rope and Asia. July-Aug. 



222. Carex membranopacta Bailey. Fragile 

 Sedge. Fig. 1089. 



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



Not Krock. 1814. 

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



1825. Not Hoppe. 

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



Similar to the last, short-stoloniferous, the culms 

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

 the culm, ii"-2i" 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-/5-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-toothed 

 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. 



