246 North American CijpcraceiE. 



and some rare southern Cyperaceae were received through his 

 liberahty. After his decease, I obtained from his amiable widow 

 a portion of the herbarium of the late Dr, Baldwin, which is 

 particularly rich in the Cyperaceae of the southern states. My 

 friend Dr. Barratt, of Connecticut, has sent me several exten- 

 sive collections of Carices and other plants of this order, from 

 the Highlands of New York, Vermont, the White Hills of New 

 Hampshire, and Connecticut. Most valuable aid has been 

 afforded me, not only in the communication of specimens, but 

 in every part of this work by my friend Dr. Gray^ The revi- 

 sion of the Rhynchosporse is entirely his own ; and the Synopsis 

 of North American Carices, I wish to have considered as our 

 joint performance. It was thought unnecessary to prepare de- 

 scriptions of these plants, except of the new species, as they 

 have so recently been made the subjects of monography by Prof. 

 Dewey, and also by Dr. Schweinitz and myself. To Charles 

 Pickering, M. D., curator of the Herbarium of the Academy of 

 Natural Sciences in Philadelphia, my best thanks are due for 

 the valuable aid he has afforded me in examining the extensive 

 collection under his charge. This herbarium contains all 

 Mr. Schweinitz's plants, a full set of Dr. Baldwin's, most of 

 Nuttall's, besides a vast number of specimens from all parts of 

 the worlds The herbarium of Dr. Muhlenberg has been repeat- 

 edly examined, and nearly all his Cyperaceae identified. 

 Michaux's herbarium in the Jardin des Plantes of Paris was 

 carefully examined in the summer of 1833, and most of his Cy- 

 peraceae satisfactorily determined. The herbarium of Pursh, 

 now incorporated in the immense collection of A. B. Lambert, 

 Esq. of London, was, with the characteristic liberality of that 

 gentleman, placed under my inspection ; but I found it very 

 deficient in Cyperaceae. 



It is, perhaps, hardly necessary to state that the exclamation 

 point used in the succeeding pages is employed iti accordance 

 with the practice of De Candolle and other recent botanical 

 writers. When affixed to the name of an author or correspon- 

 dent it indicates that an original or authentic specimen has been 

 examined or received by myself. Localities from which 1 

 have seen specimens are designated by the same sign. 



