222 FLORA. 



1 68. Carex muricata L. LESSER PRICKLY SEDGE. (I. F. f. 838.) Bright 

 green ; culms slender, roughish, at least above, 3-7 dm. long. Leaves 2-3 mm. 

 wide, shorter than the culm ; bract short, subulate ; spikes 5-10, 4-io-flowered, 

 clustered into an oblong head, or the lower I or 2 distant ; perigynia ovate or 

 ovate- lanceolate, 4 mm. long, smooth, shining, nerveless, spreading or radiating 

 when mature, not reflexed, tapering into a rough-edged 2-toothed beak as long as 

 the body ; scales ovate or ovate-oblong, acute, shorter than the perigynia. In 

 meadows and fields, Mass, to N. Y., Ohio and Va. Naturalized from Europe. 

 June- Aug. 



169. Carex sparganioides Muhl. BUR-REED SEDGE. (I. F. f. 839.) 

 Rather dark green with nearly white sheaths ; culms rough, 3-angled, 5-9 dm. tall. 

 Leaves flat, 5-9 mm. wide, the lower very short ; spikes 6-12, oblong or subglo- 

 bose, 5-8 mm. in diameter, the upper aggregated, the lower 2-4 commonly 

 separated ; perigynia flat, ovate, 3 mm. long, spreading or radiating, pale, 

 narrowly wing-margined, usually few-nerved on the outer face, the rough 2-toothed 

 beak one-fourth to one-third the length of the body ; scales ovate, acute or cuspi- 

 date, about one-half as long as the perigynia. In woods and thickets, Mass, to 

 Ont., Mich., Va., Ky., Iowa and Mo. June- Aug. 



170. Carex cephaloidea Dewey. THIN-LEAVED SEDGE. (I. F. f. 840.) 

 Similar to the preceding ; culms rough above. Leaves flat, 4-8 mm. wide, thin 

 and lax, somewhat shorter than the culm ; bracts usually short ; spikes 4-8, sub- 

 globose, in an oblong cluster ; perigynia ovate or ovate-lanceolate, greenish 

 brown, nearly 4 mm. long, ascending, nerveless or faintly few-nerved, tapering into 

 a rough 2-toothed beak one-fourth to one-third as long as the body ; scales ovate, 

 white, short-cuspidate or awned, about one-half as long as the perigynia. In dry 

 fields and on hills, Mass, to Penn., 111., Mich, and Wyo. May-July. 



171. Carex cephalophora Muhl. OVAL-HEADED SEDGE. (I. F. f. 841.) 

 Pale green ; culms slender, rough above, 2.5-6 dm. tall. Leaves 2-4 mm. wide; 

 bracts of the lower spikes bristle-form; spikes few, subglobose, clustered in a short- 

 oblong head 8-16 mm. long ; perigynia broadly ovate, 2 mm. long or less, pale, 

 nerveless or very faintly few-nerved, tipped with a 2-toothed beak about one-fourth 

 the length of the body ; scales ovate, rough-cuspidate or awned, equalling or a 

 little shorter than the perigynia. In dry fields and on hills, Me. and Ont. to Man., 

 Fla., Mo. and Tex. May July. 



172. Carex Leavenworthii Dewey. LEAVENWORTH'S SEDGE. (I. F. f. 842.) 

 Similar to the preceding, but smaller ; culms almost filiform, roughish, 1.5-4 dm. 

 tall. Leaves narrower, 1-3 mm. wide, mostly shorter than the culm ; bracts of the 

 lower spikes bristle-form or wanting ; spikes 4-7, densely crowded ; perigynia 

 orbicular-ovate, rather less than 2 mm. long and about as wide, tipped with a very 

 short 2-toothed beak ; scales ovate, acute or cuspidate, shorter and narrower than 

 the perigynia. In meadows, Iowa to Miss., Ark. and Tex. May-June. 



173. Carex Muhlenbfergii Schk. MUHLENBERG'S SEDGE. (I. F. f. 843.) 

 Light green ; culms slender, erect, 3-angled, rough, at least above, 3-6 dm. tall. 

 Leaves 2-4 mm. wide, usually shorter than the culm, somewhat involute in drying; 

 bracts bristle-form, usually short ; spikes 4-10, ovoid or subglobose, close together 

 in an oblong head ; perigynia broadly ovate-oval, 3 mm. long, strongly nerved 

 on both faces, ascending, with a short 2-toothed beak; scales ovate -lanceolate, 

 rough -cuspidate or short-awned, narrower and mostly longer than the perigynia. 

 In dry fields and on hills, Me. and N. H. to Ont., Minn., Fla. and Tex. 

 May-July. 



Carex Muhlenb^rgii Xalapdnsis (Kunth) Britton. Perigynia nearly or qqite nerve- 

 less ; leaves broader and longer. S. N. Y. to Mo., Tex. and Mex. 



Perigynia radiately spreading, or reflexed when old. 



Perigynia distinctly nerved on both faces, the beak rough. 



Perigynia lanceolate ; beak more than half as long as the body. 



174. C. sterilis. 

 Perigynia ovate; beak about one-third as long as the body, abrupt. 



175. C. Atlantica. 

 Perigynia faintly nerved on the outer face, nerveless or nearly so on the inner; beak 



smoothish. 176. C. interior. 



