478 ULMUs. 



are vaiiotics; or ovcii to wliai spocics the varioiios belong. ]\Ir. liOudon wast 

 an opinion that there are only two kinds truly distinct; namely, I'hnns canipet 

 tris, and niontana. Tlie rinius aniericana he would consider as alli<'d to U. 

 campestris, from an assertion made by Mr. Masters, of Canterbury, in l-]ngland, 

 who has paid tireat attention to this t;enns, and has rai.sed many sorts, both I'rom 

 .Vmerican and l-lur(j[)ean seeds, lie assured him that the American species is 

 identical, or apparently so, with what is called the " Huntingdon l\llm," (U. 

 montana vegcta, of Lindley,) a variety raised at Huntingdon, from seeds gath- 

 ered from trees in that neighbourhood, about a century ago. To us, it appears 

 more probable that the llmus montana belongs to U. campestris, and that Ulmus 

 americana, and most, if not all, other American elms, form a distinct species; 

 their variations being caused by the difference of soil and climate, or by hybrid- 

 ation. Therefore, for the sake of brevity, and convenience of classification, as 

 in the genera tilia, fraxinus, &c., we have brought the elms all under two heads; 

 namely, Ulmus campestris, and americana, and have considered the kinds, which 

 are usually treated as species by botanists, only as varieties. Those, however, 

 who differ from us in opinion, will find no difficulty in recognizing among our 

 synonymes, the names as given by Willdenow, Michaux, Loudon, and others, 

 and will be enabled t: know under what heads they are described in the works 

 of these authovs. 



