110 BULLETIN OF THE 



In the Gamopetalce, before and including Composite, in the Mono- 

 chlamydece, and throughout the Monocotyledons, serious difficulties 

 occur in consequence of a want of recent systematfc works from 

 the American point of view. In nearly all cases the names as well 

 as the arrangement of Gray's Manual, 5th edition, have here been 

 adopted. I have, however, been able to avail myself of a number 

 of recent revisions of genera made by Gray, Watson, and Engel- 

 man* and published in various forms, chiefly in the Proceedings 

 of the American Academy of Arts and Sciences. I have also 

 derived many useful hints from the Flora of California, from the 

 botanical reports of the various Western Surveys, from Sargent's 

 Catalogue of the Forest Trees of North America, and from the 

 Flora of Essex county, Massachusetts. 



Mr. M. S. Bebb, of Rockford, Illinois, has shown great kindness 

 not only in determining all the uncertain Salices, but in generously 

 drawing up a list of them in the order of their nearest natural 

 relationship, which is followed implicitly in the catalogue. 



For the Ferns, the magnificent work of Prof. Eaton has furnished 

 everything that could be desired, and is unswervingly adhered to. 



The following genera in the Composite have been changed by 

 Bentham and Hooker, but the new names cannot be adopted until 

 the species have been worked up by American botanists. The old 

 ones are therefore retained with a simple indication of the recent 

 disposition. 



Maruta has been made Anthemis. 

 Leucanthemum has been made Chrysanthemum. 

 Cacalia has been made Senecio. 

 Lappa has been made Arctium. 

 Cynthia has been made Krigia. 

 Mulgedium has been made Lactuca. 

 Nabalus has been made Prenanthes. 



* While I have gladly adopted the arrangement of the species of Quercus decided 

 upon by Dr. Engelman after so careful a study, I cannot do so without recording 

 a gentle protest against the position to which he assigns Q. palustris. viz : be- 

 tween Q. falcata, and Q. nigra, and far removed from Q. rubra. Not only the 

 shallow, finely scaled cup, but especially its light colored buds and thin early 

 leaves, as also a special fades belonging to its aments and foliage ally this species 

 with Q. rubra, and distinguish these two species as a group from all others found 

 in this flora. 



