OP NORTH AMERICA. 7 



rare, 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^ Cercis canadensis^ 

 many Oaks, Maples &c ; but others are con- 

 fined to narrower limits, or even few localities. 

 The Magnolia macrophyla, Virgilia or rather 

 Cladrastis, Hamiltonia, Bigelowia, Frank- 

 linia t 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 Pavias, Caly- 

 canthus, Crategiis, &c, with many that I shall 

 enumerate in this Sylva. 



The foliation, floration and semination of our 

 woody plants, deserve to be better studied as . 

 to periods and duration, in order to seek them 

 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- 



