16 Geographical Botany of the United States. 



and passing through the Carolinas, it is met with in Virginia, at 

 Philadelphia, and as far north as Boston. It is met with in similar 

 situations through the Middle States, and as far west as Missouri : 

 laving a range, therefore, of 1000 miles north and south, and of 

 the same extent east and west, and I am inclined to believe it will 

 be found as far west as the base of the Rocky Mountains. It is 

 moreover peculiar to the United States, and exists in situations 

 which oppose to the opinion that it has emigrated from place to 

 place. 



Cephalanthus occidentalism Lin. Has a range equally extensive. 

 It grows also in the swamps, ponds, and margins of streams, and 

 does not appear to undergo muchchange in its appearance. Found 

 as far west as the Canadian fork of the Arkansas. 



Mitchella repens, Lin. with its fragrant flowers, is found in the 

 shady forests of Canada, and in similar situations through the 

 Northern Atlantic States, and as far south as Georgia. Also on 

 the Arkansas, and in the Cherokee country. 



Dodecantheon media, Lin. (American cowslip,) though not so 

 common at any given place, has an extensive range from east to 

 west. We find it in Pennyslvania, Ohio, Missouri, and specimens 

 were collected by Captain Lewis at the mountainous sources of the 

 Missouri ; and within the Rocky Mountains, by Dr. James. 



Tradescantia virginica, L. extends through the Atlantic States* 

 from Pennsylvania to Georgia— westward through Ohio* on the 

 western shores of Lake Michigan, and through the Prairies of Ilr 

 linois and Missouri. It is also found in the Cherokee country. 



The history of the genus Trillium, which, with a single excep- 

 tion, belongs to North America, is highly interesting in connexion 

 with the view we are taking. Some of the species, as T. grandi- 

 jlorum, Salisb. T. erectwn, Pursh, have a range of the widest 

 extent. T. grandiflorum is found in the mountains of Georgia and 

 Carolina ; in Virginia and Pennsylvania ; near Albany, New-York, 

 and in the western part of the latter state ; becoming more abun- 

 dant through the moist prairies of Ohio, Indiana and Illinois. 



Other species of this genus have a more limited range, and oth- 

 ers again, though not found in the Northern Atlantic States, are 

 seen in Carolina and Georgia, and passing west of the Alleghanies, 

 are found again on the banks of the Arkansas and Missisippi. 

 Such are the sessile species, of which two have already been des- 

 cribed, and the number of which will undoubtedly be increased. 



