GENUS 18. 



SEDGE FAMILY. 



435 



224. Carex bullata Schk. Button Sedge. Fig. 1091. 



Care.v bullata Schk.; Willd. Sp. PI. 4: 309. 1805. 



Carex Olneyi Boott, 111. Car. i: 15. 1858. 



Care.v Greenti Boeck. Flora 41 : 649. 1858. 



C. bullata var. Greenii Fernald, Rhodora 8: 202. 1906. 



Glabrous, culms slender, erect, i-32 high, roughened above 

 on the sharp angles. Leaves and bracts narrow and elongated, 

 rather stiff, commonly overtopping the culm, rarely more than 

 2" wide, rough-margined, sparingly nodulose ; staminate spikes 

 mostly 2, long-stalked ; pistillate spikes 1-3, usually 2, light green, 

 varying from almost sessile to long-stalked and spreading, many- 

 flowered, oblong to cylindric, i'-2' long, 42 "-9" in diameter ; 

 perigynia much inflated, strongly nerved, dull or shining, ovoid, 

 2n"-4" long, ascending-spreading, contracted into a subulate 

 rough 2-toothed beak, longer than the lanceolate acuminate to 

 obtusish scale; stigmas 3. 



In swamps, Maine to Georgia. June-Aug. 



225. Carex Tuckermani Dewey. 



Tuckerman's Sedge. 



Fig. 



1092. 



C. Tuckermani Dewey, Am. Journ. Sci. 49': 48. 1845. 



Glabrous, culm very slender, roughened above on 

 the angles, erect, ii -3* tall. Leaves and bracts 

 much elongated, commonly much overtopping the 

 culm, \\"-2.\" wide, more or less nodulose; stami- 

 nate spikes 2 or 3 ; pistillate spikes stout, cylindric, 

 i '-2' long, 6"-o," in diameter, the upper sessile or 

 nearly so, the lower stalked and usually spreading; 

 perigynia very much inflated and bladder-like, 

 shining, broadly ovoid, prominently few-nerved, 

 ascending, abruptly contracted into a smooth subu- 

 late 2-toothed beak; scales lanceolate, acute to 

 short-cuspidate, less than half as long as the peri- 

 gynia; achenes prominently excavated in middle; 

 stigmas 3. 



In bogs and meadows, New Brunswick to Minnesota, 

 south to New Jersey, Indiana and Iowa. June-Aug. 



226. Carex retrorsa Schwein. 



C. retrorsa Schwein. Ann. Lye. N. Y. i : 71. 1824. 

 Carex Hartii Dewey, Am. Journ. Sci. (II.) 41 : 

 1866. 



Retrorse Sedge. 



226. 



Fig. 1093. 



Glabrous, culm stout, erect, smooth or slightly 

 rough above, i-3* tall. Leaves much elongated, 

 thin, rough-margined, nodulose, 2tr"-5" wide, the 

 upper commonly exceeding the culm, the bracts 

 similar, usually very strongly overtopping the culm ; 

 staminate spikes 1-3, short-stalked; pistillate spikes 

 3-8, ascending or spreading, all close together at the 

 summit and sessile or very nearly so, or the lowest 

 distant and stalked, cylindric, densely many-flowered, 

 i '-3' long, 7"-io" in diameter; perigynia ovoid, 

 membranous, strongly few-nerved, yellowish green, 

 3$"-5" long, the lowest at least reflexed at maturity, 

 tapering into a subulate 2-toothed beak; scales lan- 

 ceolate, acute or acuminate, smooth, one-third to 

 one-half as long as the perigynia ; stigmas 3. 



In swamps and wet meadows, Newfoundland to Brit- 

 ish Columbia, south to Pennsylvania, Iowa and Oregon. 

 Very variable. Aug.-Sept. 



