224 



Cyperaceae 



Carex 



50 



Map 432 



Carex aggregata Mack. 



50 



Map 433 



Carex sparganioides Muhl. 



of the bodies of the perigynia and have a conspicuous green center. In C. 

 cephaloidea the pistillate scales are obtuse or at most acute, half the length 

 of the bodies of the perigynia or shorter, and are hyaline throughout (never 

 becoming coppery-tinged at maturity as in C. alopecoidea) except for the 

 faint green midrib. 



N. B. to Minn., southw. to N. J. and 111. 



13. Carex aggregata Mack. (Bull. Torrey Bot. Club 37: 246. 1910.) 

 Map 432. Infrequent on banks of creeks, on dry grassy and partially 

 wooded slopes, in low open woods, and as a weed in lawns. The perigynia 

 are very susceptible to infection by a smut which often prevents their 

 maturing. 



N. J. to D. C, westw. to Kans. and Okla. 



14. Carex sparganioides Muhl. Map 433. Very common in dry woods 

 (usually sugar maple, beech or white oak), thickets, and along roadsides. 

 One of the most abundant sedges in the state. 



Que. to S. Dak., southw. to Va., Ky., and Kans. 



5. § MULTIFLORAE 



Beak of perigynium much shorter than the body; perigynium subcoriaceous; leaves 

 usually shorter than the culms. 

 Perigynia mostly broadest at the base, usually nerved dorsally, 2 mm or more wide; 



beak of perigynium prominent, conspicuously cleft 15. C. annectens. 



Perigynia mostly broadest at or below the middle, nerveless dorsally, usually less 

 than 2 mm wide; beak of perigynium very small, obscurely cleft; heads gen- 

 erally horter and denser 15a. C. annectens var. xanthocarpa. 



Beak of perigynium about equaling the body; perigynium membranaceous; leaves 

 normally exceeding the culms. 



Perigynia ovate, the body corky-margined to the base, contracted into the beak 



1(5. C. vulpinoidea. 



Perigynia narrowly lanceolate, the body thin-edged and not at all corky-margined, 

 tapering gradually into the beak; teeth of perigynium almost obsolete; plant 

 low, densely cespitose; leaves narrow, rigid; inflorescence short, broad, and con- 

 gested. (See excluded species no. 3, p. 272) . . . .C. vulpinoidea var. pycnocephala. 



