232 Cyperaceae Carex 



10. § deweyAnae 



34. Carex bromoides Schkuhr. Map 455. Frequent to common except 

 in the unglaciated area, in wet woods, swamps, and bogs and on borders 

 of ponds and springy banks of streams. 



Que. to Wis., southw. to Fla. and La. 



11. § O VALES 



Wing of perigynium not narrowed near the middle of the body; leaf blades of sterile 

 culms erect or ascending, usually clustered toward the top; sterile culms often 

 poorly developed. 

 Perigynia not obovate, widest near the middle or base. 

 Leaf sheaths strongly white-hyaline ventrally. 



Perigynia lanceolate to narrowly ovate-lanceolate, 3 to 4 times as long as wide. . 



35. C. scoparia. 



Perigynia ovate-lanceolate or broader, at most twice as long as wide. 

 Perigynia narrowly to broadly ovate, 3-4 mm long. 



Leaf blades 1.5-4.5 (averaging 2.5) mm wide; sheaths not mott'ed with 

 green and white dorsally. 

 Perigynia 3-3.5 mm long; spikes closely aggregated, not clavate at base. . . 



36. C. Bebbii. 



Perigynia 3.5-4.5 mm long; spikes not aggregated, usually in a flexuous, 



monilif orm inflorescence, clavate at base 37. C. tenera. 



Leaf blades 2.5-6 (averaging 4) mm wide; sheaths mottled with green and 

 white dorsally; perigynia less abruptly beaked and beak narrower than 



in C. tenera 38. C. normalis. 



Perigynia (2.75) 3.5-6.5 mm long, the body suborbicular. 



Perigynia 3.5-5.5 mm long, thick, coriaceous or subcoriaceous, usually plano- 

 convex. 

 Perigynia averaging (2.75) 3.5-4 mm long, the beak half the length 

 of the body or more; achene 1.5 mm long, oblong-ovoid; spikes in a 



moniliform inflorescence 39. C. festucacea. 



Perigynia 3.75-5.5 mm long, the beak less than half the length of the body; 



achenes 1.75-2 mm long, orbicular or suborbicular when fully mature; 



spikes aggregated or in a moniliform inflorescence. 



Perigynia ovate, submembranaceous, few-nerved ventrally, broadest near 



the base, tapering into the beak, the beak broader than in C. brevior, 



especially toward the base 40. C. molesta. 



Perigynia broadly ovate to suborbicular, coriaceous, usually nerveless 

 or nearly so ventrally, broadest near the middle, abruptly contracted 



into the beak 41. C. brevior. 



Perigynia 5.6-6.5 mm long, flat and thin, nearly transparent 



42. C. Bicknellii. 



Leaf sheaths green and strongly nerved ventrally nearly to the mouth. 



Scales cuspidate or even obtuse; perigynia nerveless or nearly so ventrally; 



spikes 2-5, aggregated into a stiff head 43. C. suberecta. 



Scales long-acuminate to aristate; perigynia nerved ventrally; spikes 4-8, in a 



very flexuous inflorescence 44. C. Richii. 



Perigynia obovate, the body widest near the top. 



Scales obtuse to short-acuminate; achenes sessile or substipitate; perigynia 1.5-3 

 mm wide. 

 Tips of perigynia appressed; perigynia with body rounded at apex; spikes ap- 

 proximate or aggregated, greenish to silvery brown. 

 Perigynia nerveless ventrally; spikes 5-25, densely aggregated; leaf blades 

 of sterile culms 3.5-5 mm wide 45. C. cumulata. 



