220 



Cyperaceae 



Carex 



5 35 



Map 422 



Carex rosea Schkuhr 



Culms lax; perigynia faintly nerved dorsally; stigmas short.. .9. C. mesochorea. 

 Culms stiff, erect; perigynia generally strongly nerved to ribbed dorsally; 



stigmas long, slender 10a. C. Muhlenbergii var. enervis. 



Inflorescence oblong or linear-oblong to elongate and interrupted; spikes not 

 capitate. 

 Perigynia strongly nerved and low-convex ventrally, the margins usually slightly 



raised 10. C. Muhlenbergii. 



Perigynia nerveless or nerved only at the base ventrally, the margins not raised 

 at maturity. 

 Perigynia sessile, short-beaked, spreading, 3-3.5 mm long; bracts not broadly 

 dilated at the base; scales about the length of and narrower than the 



bodies of the perigynia, cuspidate or short-aristate 



10a. C. Muhlenbergii var. enervis. 



Perigynia stipitate, long-beaked, ascending, 3.5-5 mm long; bracts broadly 

 dilated at the base; at least the lower scales exceeding and as wide as 



the perigynia, long-awned. (See excluded species no. 2, p. 272) 



C. austrina. 



Sheaths loose, mottled with green and white and usually septate-nodulose dorsally; leaf 



blades 4.5-8 (in C. aggregata rarely only 3) mm wide. 



Perigynia not deep green at maturity, with border raised ventrally only above the 



middle, the beak a fourth to a third the length of the ovate or suborbicular 



body or, if longer, the ventral suture deep; spikes approximate in a cylindric 



or ovoid head. 



Perigynia ovate, tapering into the beak, typically smooth or faintly nerved 



dorsally, beak very sharply bidentate, the teeth about 1 mm long; pistillate 



scales mostly strongly awned; leaf blades rarely over 5 mm wide 



11. C. gravida. 



Perigynia broadly ovate to suborbicular, abruptly beaked, typically strongly ribbed 

 dorsally; beak less sharply bidentate, the teeth about 0.5 mm long; pistillate 

 scales mostly acuminate to short-awned; leaf blades often 6-8 mm wide.... 



11a. C. gravida var. Lunelliana. 



Perigynia deep green, the beak a third the length of the ovate body or more or, if 



rarely shorter, the ventral suture shallow. 



Mature perigynia membranaceous, flat ventrally; leaf blades 3-7 mm wide; spikes 



approximate or the lower separate. 



Scales acute or somewhat obtuse, half the length of the bodies of the perigynia; 



stigmas short; sheaths truncate at the mouth, the lower transversely 



rugulose; perigynia narrowly ovate or even elliptic with a narrow, gradually 



contracted beak; culms often slightly winged 12. C. cepJialoidea. 



