6 FIELD COLUMBIAN MUSEUM BOTANY, VOL. i. 



Americana, as previously noted. The arrangement of the natural 

 orders is that of Engler and Prantl in Die Naturlichen Pflanzen- 

 familien, as far as published, otherwise that of Bentham and Hooker's 

 Genera Plantarum. The nomenclature is in accordance with the 

 " Rochester rules " as far as our reference facilities would permit. 



The determination of the species was made by the author in the 

 Herbarium of the Shaw Botanical Gardens at St. Louis, through the 

 courtesy of the Director, Prof. Wm. Trelease, with the exception of 

 a few which were kindly compared in the Gray Herbarium, Harvard, 

 by Prof. B. L. Robinson, and the orders credited to specialists in the 

 body of the list. 



CHICAGO, August, 1895. 



