268 



Cyperaceae 



Carex 



50 



Map 558 



Carex rostrata Stokes 



Tuck 



ermani 



50 



Map 559 

 Boott 



o ~w 

 Map 560 



Carex retrorsa Schwein. 



Greenland to Alaska, southw. to Del., W. Va., Ind., S. Dak., N. Mex., and 

 Calif. ; also in Eurasia. 



130. Carex Tuckermani Boott. Map 559. Frequent in northeastern 

 Indiana; otherwise known in the state only from the dune area and from 

 Floyd County. It is found in swales in woods, swamps, and on borders of 

 ponds, frequently in shallow water. 



N. B. to Minn., southw. to N. J., Ind., and Iowa. 



131. Carex retrorsa Schwein. Map 560. Known in Indiana from two 

 collections near the northern border of the state ; edge of swamp, East 

 Chicago, Lake County, W. S. Moffatt, July 2, 1893, and, near St. Mary's 

 Academy, Notre Dame, St. Joseph County, J. A. Nieuwland, July 9, 1913. 



No corroborating specimens have been seen for the report in Coulter's 

 Catalogue from Gibson County, Wilson's report from Hamilton County or 

 Schneck's from the Lower Wabash Valley. 



Que. to B. C, southw. to N. J., Ind., Iowa, Colo., and Oreg. 



132. Carex oligosperma Michx. Map 561. Frequent in the dune area, 

 otherwise quite local in northern Indiana. It prefers Chamaedaphne and 

 tamarack bogs, but is found also in marshes and swales and on borders 

 of ponds. 



Newf. to Mack., southw. to Mass., Pa., and Ind. 



L33. Carex lurida Wahl. Map 562. Very common; in southern In- 

 diana ubiquitous in swamps, sloughs, ditches, and wet habitats of all types. 



Carex lurida is frequently confused with C. hijstncina and with C. 

 lupulina. The following distinctions, in addition to those given in the key 

 to the sections, may be useful in separating it from these. The achene of 

 C. lurida is strongly rough-papillate; that of C. lupulina is perfectly 

 smooth. Also the teeth of the perigynia in C. lurida are very short (aver- 

 aging 0.5 mm long) and the stigmas all protrude from one side; in C. 

 hijmlinn the teeth are long (0.75-2 mm) and the stigmas radiate irregu- 

 larly from the orifice. In C. hystricina the teeth of the perigynia are longer 



