Vili EDITOR’S PREFACE. 
the troublesome plants of the West, which have been acknowledged in 
the proper places. I am also indebted to J. A. Lapuam, Esq., for his 
» which came too late to be available, to furnish notes upon the 
weeds of Wisconsin. The more important illustrations in the work are 
from original drawings, by AnrHony Hocusrern, Esq., whose delicate 
sketches have hardly justice done them by being rendered in wood. The 
most of his drawings are designated by his initials. The remainder of the 
engravings were obtained from the best available sources. My friend, 
Mr. Frank A. Pouuarp, has rendered me most essential aid, both be- 
fore and during the rapid printing of the work, which I would gratefully 
acknowledge. 
‘Where new observations or other matter has been added, or the old 
ones essentially modified, a * has been appended. This, however, has 
been omitted where the alterations are aenseteaé in these cases any 
faults may be placed to the account of the editor. 
New Yorr, January 31st, 1859. 
