260 



('VPERACEAE 



Car ex 



Miles 



5(5 



Map 534 



Carex lasiocarpa Ehrh. 



Miles 



o 56 



Map 536 



Carex limosa L. 



32. § LIMOSAE 



109. Carex limosa L. Map 536. Infrequent in tamarack bogs and on 

 mucky lake borders in northern Indiana. It is usually found in sphagnum. 



Lab. and Newf . to Yukon, southw. to Del., Iowa, Mont., and Calif. ; 

 also in Eurasia. 



33. § ATRATAE 



110. Carex Buxbaumii Wahl. {Carex polygama Schkuhr, not Gmelin.) 

 Map 537. Rather common among the dunes; infrequent elsewhere in 

 northern Indiana. Among the dunes it is found in swales and on inter- 

 dunal flats; elsewhere in marshes and low sandy or marly openings. In 

 southern Indiana it occurs in swampy woods. 



Newf. to Alaska, southw. to Ga., Ark., Colo., Utah, and Calif.; also in 

 Eurasia. 



34. § ACUTAE 



Beak of perigynium very short, or absent, not twisted; pistillate spikes erect; culms 



relatively slender to the base, very rough above. 



Culms strongly phyllopodic (sterile shoots sometimes aphyllopodic) ; fertile culms 



surrounded at the base by the dried-up leaves of the previous year; perigynia 



strongly flattened, not at all turgid, obovoid, 2.75-3.2 mm long, 1.5-2.75 mm 



wide HI. C. substricta. 



Culms aphyllopodic; fertile culms all or mostly arising laterally and not surrounded 



at the base by the previous year's tufts of leaves; perigynia 2-2.75 mm long, 



1.25-1.75 mm wide. 



Perigynia inflated, strongly biconvex, brownish at maturity, broadly ovate to 



suborbicular, 2-2.25 mm long; pistillate scales divaricate at maturity; ligule 



sligbtly longer than wide; lower sheaths slightly if at all filamentose; stolons 



short, ascending; achenes suborbicular 112. C. Haydenii. 



Perigynia not inflated, closely enveloping the achenes, unequally biconvex, green 



or straw colored, 2.25-2.75 mm long; stolons long, many, horizontal; achenes 



oblong to obovate. 



Lower sheaths not filamentose ventrally, strongly septate-nodulose dorsally; 



ligule much wider than long; pistillate spikes (3) 4-5, the lower 2-10 cm 



long; perigynia ovate or obovate, 1.5-1.75 mm wide 113. C. Emoryi. 



