Carex 



Cyperaceae 



241 



50 



Map 483 



Carex penn sy Ivanica Lan 



50 



Map 484 



Carex umbellata Schkuhr 



50 



Map 485 



Carex rugosperma Mack. 



59. Carex heliophila Mack. (Torreya 13: 15. 1913.) (Carex penusyl- 

 vanica var. digyna Bock.) Map 482. A prairie species represented from 

 Indiana by two collections by Deam: in a sandy black oak woods 2 miles 

 southwest of Tefft, Jasper County, June 6, 1924, and on top of the high 

 gravelly bank of Big Wea Creek terrace 4 miles southwest of Lafayette, 

 Tippecanoe County, June 3, 1924, and May 24, 1932. At the latter station 

 it was plentiful in an open black oak-shagbark hickory grove with such 

 other prairie or western species as Androsace occidentalis, Petalo sternum 

 purpureum, Arenaria patula, Opuntia Rafinesquii, and, nearby, Muhlen- 

 bergia cuspidata, Sporobolus clandestinus, and Erysimum asperum. Other 

 associated plants were Festuca octo flora, Poa pratensis, Penstemon hirsu- 

 tus, Houstonia longi folia, and Acerates viridiflora. 



Man. to Alberta, southw. to Ind., Mo., and N. Mex. 



60. Carex pennsylvanica Lam. Map 483. Common in northern Indiana, 

 less frequent southward, and rare or absent from the southernmost coun- 

 ties. Like Carex communis it is a species flowering in early spring, found 

 in similar localities but preferring somewhat more open habitats and gen- 

 erally in more sterile soils. It usually forms rather extensive colonies, 

 sometimes comprising the dominant floor cover in open oak woods. 



N. S. to N. Dak., southw. to S. C, Tenn., and Iowa. 



61. Carex umbellata Schkuhr. (Bull. Torrey Bot. Club 42: 621. 1915.) 

 (Carex abdita Bickn. and Carex umbellata var. brevirostris Boott.) Map 

 484. Infrequent in northern Indiana in dry sandy soil, usually in open 

 woods ; frequent in southeastern Indiana on crests of rocky wooded ridges 

 and river bluffs. This and the two following species may be more common 

 than the records indicate because they are low, inconspicuous plants, easily 

 overlooked by collectors. 



In this species the longest peduncles are typically not over 8 cm in 

 length and generally bear a staminate spike only. But on the dunes the 

 prevalent form has elongated peduncles 12-20 cm in length which usually 

 bear one or more pistillate spikes in addition to the staminate. This 



