North American Cyperacccs. 443 



Cladium effusum, p. 374. According to Mr. Nuttall, 

 this plant extends a considerable distance northward beyond 

 Wilmington, North Carolina, often occupying, almost exclu- 

 sively, considerable ponds* 



Carex tenuiflora, p. 392. Tackmahack Swamp, South- 

 ampton, Massachusetts, Dr. Chajnncm ! ; Ogdensburgh, St. 

 Lawrence Co., New-York, Dr> Crawe! 



C. SUBULATA, p. 419. Near Fayetleville, North CaroHna, 

 Mr. Curtis! 



ScLERiA RETICULARIS, p. 375. Wet sandy places, near 

 the sea coast, Suffolk County, Long Island! September. 



S. LAXA, p. 376. Add, Hab. New Jersey to Florida; 

 not found far from the sea coast ! September. 



Note. Mr. Arnott states, in a letter received since the fore- 

 going sheets were printed, that he has examined the specimen 

 on which Ceratoschcemis corjiiculatus of Nees ab Esenbeck 

 was founded. The plant is, in his opinion, nothing more than 

 Schoenus corniculatus, LairCk. (Rhynchospora corniculata, 

 Gray) in which, contrary to the usual state, the beak is some- 

 what curved. The reader will perceive that the character of 

 this well-marked genus has been amended in the present mo- 

 nograph so as to apply to the normal form of C. corniculatus^ 

 and also to include a new species. The specific name of La- 

 marck must, of course, be retained. 



