Carex 



Cyperaceae 



219 



50 



Map 418 



Carex Sartwelhi Dewe 



Jan. 



Feb. 



Mar. 



Apr. 



May 



June 



July 



Aug 



Sept. 



Oct. 



Mov 



Dec 



Miles 



50 



Map 418a 

 Carex Sartwellii 

 var. stenorrhyncha Hermann 



Carex siccata Dew 



51 



Map 419 



ey 



3. § CHORDORRHIZAE 



3. Carex chordorrhiza L. f. Map 420. A northern species reaching the 

 southern limit of its range in northern Indiana where it is rare. The two 

 Indiana collections are from very wet sphagnum bogs ; elsewhere in its 

 range it is found also on peaty borders of lakes. The Indiana stations are : 

 in a tamarack bog a mile south of Leesburg, Kosciusko County, and in an 

 open tamarack bog west of Goose Lake, Whitley County. 



Lab. and Newf . to Keewatin, southw. to N. Y., Ind., Iowa, and Sask. ; 

 also in n. Eurasia. 



4. § BRACTEOSAE 



Sheaths tight, inconspicuously or not at all mottled with green and white or septate- 

 nodulose dorsally (except sometimes in C. Leavenwortkii) ; leaf blades 1-4.5 mm 

 wide. 

 Perigynia distended and spongy at the base, usually widely spreading or reflexed at 

 maturity. 

 Beaks of perigynia smooth, scarcely exceeding the acuminate, deciduous scales. 



4. C. retro flexa. 



Beaks of perigynia minutely serrulate, much exceeding the obtuse or somewhat 

 acute, persistent scales. 

 Stigmas long, slender, usually not twisted, light reddish; perigynium tapering 



into the beak ; leaf blades 1-2 mm wide 5. C. rosea. 



Stigmas short, stout, strongly twisted or contorted, deep red; perigynium 

 abruptly contracted into the beak. 

 Leaf blades 1.5-3 (averaging 2.5) mm wide; spikes with 6-20 perigynia; 



perigynia 3.25-4.5 mm long 6. C. convoluta. 



Leaf blades 1-1.75 (averaging 1) mm wide; spikes with 2-6 perigynia; peri- 

 gynia 2.25-3 mm long. (See excluded species no. 1, p. 271) . . . . C. radiata. 

 Perigynia not distended and spongy at the base, mostly ascending. 

 Inflorescence ovoid or oblong-ovoid; spikes densely capitate. 

 Scales much shorter than the bodies of the perigynia. 



Perigynia broadest below the middle, round-tapering at the base, with raised 



margins ventrally; beaks long, serrulate 7. C. cephalophora. 



Perigynia broadest at the truncate-cordate base, flat ventrally; beaks short, 



smooth 8. C. Leavenworthii. 



Scales from little shorter to longer than the bodies of the perigynia. 



