PREFACE. XI 



York, for the Characese ; and to Prof. T. C. Porter, of Easton, 

 Peima. ; Prof. Samuel Lockwood, of Freehold ; Dr. O. R. Willis, 

 of White Plains, New York ; Messrs. W. M. Wolfe and H. 

 H. Rusby, of the North Jersey Botanical Club ; Mr. W. H. 

 Leggett, of New York ; Mr. R. W. Brown, of Keyport, and 

 Mr. Frank Tweedy, of Plainfield, for manuscript lists and notes 

 on the Flora of diiferent sections of the State. 



N. L. BRITTON. 



