OF NORTH AMERICA. 



the Missourian regions, with its vast central 

 plains ; there they chiefly fringe tlie banks of 

 streams, seldom forming groves and forests. 

 This scanty dispersion prevails also more or 

 less into the Origon Mts. and Shores, extending 

 South to New Mexico, California, Texas and 

 even Mexico ; where the thick extensive For- 

 ests of the AUeghanian and Canadian regions 

 are unknown. This straggling growth of Trees 

 prevails also to a certain extent from Louisi- 

 ana to Florida where groves are intermixt with 

 meadows, glades, sand flats, cane brakes, 

 swamps &.C,. and even in the Western States, 

 on both sides of the River Ohio, the trees are 

 not so thick set, being far apart and w ith few er 

 shrubs for undergrowth. 



Of the extensive tribes of Composites, Cru- 

 ciferous, Euphorbides, Alsinides, Dianthides, 

 Geranides, &>c hardly any are shrubby in North 

 America, while so many are such elsewhere. 

 Our shrubby Vines belong chiefly to Sarmen- 

 tacea, Rhamnides, Bignonides, Woodbines, 

 Smilacea ^c. 



All the tribes of European and Siberian trees 

 or shrubs are found also in North America,and 

 nearly all their Genera likewise, except the 

 Heaths, Daphnes, and a few others. But the 

 American Sylva can boast of a greater num- 

 ber of species in all the Genera, with several 

 peculiar tribes and many American Genera; 

 such as Liriodendron, Magnolia, Asimina.Ara- 

 lia, Catalpia, Hamamelis, Fothergiila, Gordo- 

 nia, Dirca, Diervilla, Comptonia, Hicoria, x\- 

 morpha, Gleditsia, Robinia, Cladrastis, Chi- 

 onanthus, Cephalanthus Slc. 



It is very remarkable that nearly all the A- 

 merican trees, and shrubs except some boreal 

 2 



