Carex 



Cyperaceae 



229 



50 



Map 447 



Carex canescens L. 



var. disjuncta Fern. 



8. S HELEONASTES 



.25. C. disperma. 



Spikes androgynous; perigynia unequally biconvex 



Spikes gynaecandrous; perigynia plano-convex. 



Lowest bract bristlelike, many times longer than its spike; perigynia 3-3.5 mm long. 



26. C. trisperma. 



Lowest bract much shorter; perigynia about 2 mm long. 



Perigynia distinctly short-beaked, loosely spreading; leaves green, 1-2.5 mm wide. 



(See excluded species no. 5, p. 272) C. brunnescens. 



Perigynia apiculate, appressed-ascending, leaves glaucous, 2-4 mm wide. 



Spikes 6-12 mm long, remote, the lowest 2-4 cm apart; perigynia 2.3-3 mm long. 



27. C. canescens var. disjuncta. 



Spikes 4-7 mm long, subapproximate or remote; perigynia barely 2 mm long. 

 27a. C. canescens var. subloliacea. 



25. Carex disperma Dewey. (Carex tenella Schkuhr.) Map 445. Fre- 

 quent in the northern counties in sphagnum in tamarack bogs and on 

 mucky borders of lakes. Reported from Putnam County by Coulter but no 

 specimen from that county could be found. 



Newf. to Yukon, southw. to N. J., Ind., N. Mex., and Calif.; also in 

 Eurasia. 



26. Carex trisperma Dewey. Map 446. Restricted to the tamarack bogs 

 of the northernmost counties where it is locally plentiful in sphagnum. No 

 specimen could be located to substantiate Coulter's report from Putnam 

 County. 



Newf. to Sask., southw. to Md., 111., and Minn. 



27. Carex canescens L. var. disjuncta Fern. Map 447. Frequent in 

 the counties along the northern border of Indiana in tamarack bogs or low 

 wet woods. 



Lab. to Wis., southw. to Pa. and Ind. 



27a. Carex canescens var. subloliacea Laest. Map 448. Infrequent 

 in the northernmost counties in swampy woods and in sphagnum in tama- 

 rack bogs. 



Lab. to B. C, southw. locally to Conn, and Ind. 



