Vill PREFACE. 
very few obScure species is added the following 
mark, (+) v.v. Occasionally added, signifies that 
such plant had been seen alive by the author.- And 
v. 8. Ina dried state. 
Anxious to restrain the limits of this publication 
within the bounds of a portable manual for the student, | 
and to confine myself as much as possible within the 
sphere of actual observation, the lower orders of Cryp- 
togamia, now becoming a partial and particular study, 
have been omitted, and the rather as they have been 
Minutely attended to by Z. Collins, Esq. and the late 
Dr. Mublenberg in his Flora Lancastriensis, which will 
shortly be published. 
Philadelphia, 
May 27th, 1818. 
VE Si eae 
tips 
pacts 
