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temperate climates of each. A considerable number 

 communicated by Kalm to Linnaeus, which the latter 

 considered as identified with certain well-known plants 

 of our quarter of the world, prove, on more accurate ex- 

 amination, to be corresponding, but distinct species. In- 

 stances occur in the genera of Carpinus, Corylus, Quer- 

 cus, as well as in the Orchis tribe, and others. These 

 points of resemblance are found mostly among the vege- 

 table productions of the eastern regions of North America. 

 Mexico, and what little we know of the intermediate 

 space, abound with different and peculiar productions. 

 So, in South America ; Peru, Guiana, Brasil, 8tc. have 

 all their appropriate plants, of which we know as yet 

 enough to excite our curiosity, rather than to satisfy it. 

 Whatever has hitherto been given to the world respecting 

 American botany has had one considerable advantage. 

 Each Flora has been founded on the knowledge and ex- 

 perience of some one or more persons, long resident, and 

 in a manner naturalized, in the countries illustrated. Those 

 regions commonly comprehended under the name of 

 North America, have afforded materials for the Flora 

 Boreali- Americana of Michaux, and the more complete 

 and correct Flora America Septentrionalis of Pursh. Mi- 

 chaux, Wangenheim, and Marshall, have particularly il- 

 lustrated the trees of those countries. But all these 

 works have been enriched by the communications and 

 assistance of men who had much more extensive and re- 

 peated opportunities of observation than their authors, 

 except Mr. Marshall, could have. Such are the vene- 

 rable John Bartram, the Reverend Dr. Muhlenberg, 

 Messrs. Clayton, Walter, Lyon, &c. The Mexican Flora 

 has received, for a long course of years, the attention of 

 the able and learned Mutis, who long corresponded with 

 Linnaeus, and whose countrymen have prepared the sump- 

 tuous Flora Peruviana ; each of the authors of which 

 has repeatedly traversed, at various seasons, the rich and 

 interesting regions, whose botanical treasures make so 



