116 Karl M. Wiegand and Arthur J. Eames 



Hilltop, Xewfield-Ithaca town line; South Hill; Six Mile Creek; Fall Creek; 

 slope of Cayuga Lake, Ithaca to Aurora ; Summer Hill ; Black Brook, Tyre ; appar- 

 ently rare or infrequent on the hills and in the McLean region. 



Me. to Man., southw. to Ga., Kans., and Mo. ; scarce on the Coastal Plain. 



Mackenzie's treatment (/. c.) of C. rosea and its relatives has been found satis- 

 factory for the local plants, though some measurements and the emphasis on certain 

 characters have been changed. The three species seem abundantly distinct. 



8. C. rosea Schk 



Damp grassland in woods and around swamps, apparently chiefly in calcareous 

 regions ; scarce. May 25-June 25. 



Michigan Hollow Swamp; Beech Woods, Six Mile Creek; hills n. e. of Caroline; 

 around McLean Bogs; arbor vitae swamp e. of Clyde; Lowery Ponds. 



Que. to N. Dak., southw. to Ga. and La., invading the Coastal Plain. 



9. C. radiata (Wahl.) Small. 



Dry scrubby hillsides and thickets, in gravelly or somewhat sandy, not clearly 

 calcareous, soils; apparently rare. June (10)20-July 30. 



X. of Caroline Center, and in the narrows between Slaterville and Caroline Center 

 (A. J. E.. K. M. W., & L. F. Randolph). 



Me. to X. Y. and Ky., southw. to N. C. and Term., chiefly in the mts. 



The C. rosea, var. radiata and var. minor, of Gray's Man., ed. 7, were each com- 

 posed of both C. rosea and C. radiata as here interpreted. It is impossible to deter- 

 mine the var. minor and the var. radiata of Dudley's Cayuga Flora. 



10. C. Muhlenbergii Schk., var. enervis Boott. (C. plana Mackenzie.) 



Dry residual soil derived from sandstone rocks and mixed with some clay ; rare. 

 June. 



Cliff crests s. of Esty Glen. 



S. Me. to Minn., southw. to Fla. and Tex.; infrequent on the Coastal Plain. 



The characters given by Mackenzie (see Bui. Torr. Bot. Club 50:350. 1923) 

 to separate this as a species from true C. Muhlenbergii do not all seem to hold true. 

 The form does not appear to be specifically distinct. The most distinctive characters 

 are a thinner-walled, less nerved, and more silvery perigynium, and thinner scales. 

 The soil in which this variety grows here is heavier than the very light sand in which 

 C. Muhlenbergii is usually found, but it is not markedly calcareous. 



11. C. cephalophora Muhl. 



Dry rocky exposed banks, in stony noncalcareous soils over sandstone and shale ; 

 common. June. 



Especially frequent about Ithaca, along the slopes of Cayuga Lake ; rare in the 

 McLean region. 



Me. to Ont. and Man., southw. to Fla. and Tex. ; frequent on the Coastal Plain. 



Similar to the two species next following, but the leaves are narrower, and the 

 small, short, and broad perigynia of the dense head are scarcely longer than the 

 scales. 



12. C. cephaloidea Dewey. (C. sparganioides, var. minor, of Cayuga Fl., probably.) 

 Damp thickets, banks, rich wooded slopes, and alluvial woodlands, in calcareous 



regions ; frequent. June. 



West Danby road, just s. of Enfield Creek ; n. of Lick Brook ; Six Mile Creek, 

 opposite Beech Woods ; Waterburg ; Fall Creek ; Taughannock Gorge ; Salmon 

 Creek, n. of Ludlowville; wet meadow n. e. of Freeville; Summer Hill; and else- 

 where. 



X. B. t" Wis., southw. to Pa.; chiefly or entirely inland. 



