

Preface. 



All the territory of the United States of America south of the 

 British boundary, except Oregon Washington and Idaho, being 

 supplied with local Floras this work is intended to fill up the 

 corner left out by other authors. 



As the writing of descriptions of plants at this late date is, to 

 a great extent, writing or copying what others have previously 

 done, it in hardly right to claim originality for work d>i e in hat 

 field; I, therefor, wish to acknowlege that I have used the works 

 of Torrey & Gray, Dr. Asa Gray, Sereno Watson. William 

 Trelease Coulter & Rose, Edward L. Greene and others, and tor 

 save repetition (which would otherwise occur on every page) 

 I wish to give full credit here f> all authors, any porti n r-f 

 whose works have been copied herein. 



Wherever possible descriptions have been drawn from speci- 

 mens in hand, l*ut some I have been unable to procure and for 

 these 1 have had no other alternative than to cpy from descrip- 

 tions already published. 



Believing that if a plant has on> cons'ant character 'hat is 

 different from any of its cogeners it is sufficient fora species; and 

 that if a plant is sufficiently distinct from others to deserve a 

 name it is tetter to have it describt-d as a distinct s\ ecies than 

 as a variety of some other species, I have therefor, raised 

 nearly all published varieties of the region embraced in this work 

 to spacific rank. 



