OF NORTH AMERICA. 
V 
mre^ it is because after paying myself all my 
expenses of travelling, collecting, preserving &c 
I cannot afford to double them for others with- 
out reward. 
Some of our trees have a wide geographical 
range, being found from Canada to Louisiana, 
such are Cornus florida , Nereis canadensis , 
many Oaks, Maples & c ; but others are con- 
fined to narrower limits, or even few localities. 
The Magnolia macrophyla , Virgilia or rather 
C ladrastis, Hamiltonia , Bigelowia , Frank - 
linia, Planera &, c have each been met with 
only in 3 or 4 places as yet by botanists, altho’ 
probably growing in others ; but when found 
they are commonly abundant in the station. 
There are however solitary trees and shrubs 
that are never or but seldom found in groves or 
social groups ; such are some Pavlas, Caly- 
canthus , Crategus , &c, with many that I shall 
enumerate in this Sylva. 
The foliation, floration and semiriationeof pur 
woody plants, deserve to be hotter ^tpdied a^ 
to periods and duration, in order to seek^ppj^ 
at the proper times and places. 
Their station is not always in Groves and 
Forests ; many are only found on the Sea 
Shores, these are called maritime — others in 
sands, or among rocks, in high Mountains, or 
along the banks of streams, or in marshes and 
swamps : they must be called arenarian, rupes- 
tral, montaneous, riparian and palustral. 
As to foliation they must be divided into 
evergreens and deciduous. These last vary 
much in the time they put on and drop off their 
leaves. I have made 4 series of them in my 
dissertation on the foliation of our Trees, 1. 
Early leaves of long duration as Willows, Ma- 
