Carex 



Cyperaceae 



233 



6 33 



Map 457 



Carex Bebbii Olne 



y 



Perigynia nerved ventrally; spikes 3-10, aggregated or somewhat separate; 

 leaf blades of sterile culms 2.5-3 mm wide; scales either nearly equaling 



perigynia or blunt 46. C. Longii. 



Tips of perigynia spreading; perigynia with body truncate-rounded at apex, 

 very abruptly beaked; spikes not aggregated, not silvery; scales acute, con- 

 spicuously shorter than the perigynia 47. C. albolutescens. 



Scales long-acuminate to aristate; achenes slenderly stipitate; perigynia 2.5-4 mm 



wide 48. C. alata. 



Wing of perigynium rather abruptly narrowed near the middle of the body; leaf blades 



of sterile culms widely spreading, numerous, not clustered at the apex; sterile 



culms strongly developed. 



Perigynia 3-7 mm long; spikes 4-15 mm long; achenes oblong-oval, 1.5 mm long; 



ligule much longer than wide. 



Tips of perigynia appressed or ascending; perigynia thin, scarcely distended over 



the achenes 49. C. tribuloides. 



Tips of perigynia recurved or widely spreading; perigynia firm, obviously dis- 

 tended over the achenes 50. C. cristatella. 



Perigynia 7-10 mm long; spikes 16-25 mm long; achenes linear-oblong, 2.5 mm long; 

 ligule as wide as long 51. C. muskingumensis. 



35. Carex scoparia Schkuhr. (Including - Carex scoparia var. condensa 

 Fern.) Map 456. Common in marshes and open swampy places ; occasional 

 in low open woods and on sandy lake borders. This sedge is frequently 

 the dominant plant in marshes or "sedge meadows" where it is usually 

 associated with Juncus effusas var. solutus, Juncus Dudleyi, and Carex 

 vulpinoidea. 



Newf. to B. C, southw. to S. C, N. Mex., and Oreg. 



36. Carex Bebbii Olney. Map 457. Infrequent in marshes and inter- 

 dunal swales in Lake County. In Noble County a single collection was 

 made by Deam in a ditch along a railroad a mile east of Kimmel. 



Plants of Carex Bebbii lacking sterile culms are occasionally difficult to 

 distinguish from C. cristatella especially before the perigynia are fully 

 mature. Leaf blades of C. Bebbii, however, vary from 2 to 4.5 mm 

 broad, those of C. cristatella from 3 to 7 mm broad. In C. Bebbii the pistil- 



