GT 



and sedges. I am under great obligations to C. F. Austin, Esq., of 

 Closter, New Jersey, a bryologist of great experience, for his invalu- 

 able services in the determination of the mosses and lichens. I also 

 return my best thanks to llev. M. A. Curtis, D. D., of Hillsborough, 

 North Carolina, one of the ablest mycologists in this couutry, who 

 has kindly determined for me many of the fungi thus far collected. 



I am indebted to the Smithsonian Institution, through the agency 

 of Prof. Joseph Henry, L. L. D., its able Secretary, for the deter- 

 mination of a portion of the shells collected at Grand Isle and else- 

 where, of which a list is annexed. 



The books consulted in the determination of plants, and with 

 reference to their medicinal and economical use, are: Gray's Manual 

 of Botany of the Northern United States, Dr. Chapman's Southern 

 Flora, Dabney's Botany of the Southern States, Brown's Trees of 

 North America, Wood & Bache's Dispensatory of the United States, 

 Bruch & Schimper's Bryologia Europsea, Pritchard's Infusoria, 

 Rabenhorst's Flora Europaea Algarum, and the Rural Cyclopaedia. 



In the list of plants of the Flora of Louisiana, I deemed it of some 

 importance, in order to render the study of botany more popular, to 

 annex to the botanical name the English name, if such has been in 

 common use; but in the cases of plants which have not yet received 

 an English designation, I anglicised the generic botanical name, and 

 translated the specific name, as far as this was practicable, so as to 

 correspond with some of the characteristics of the plant which it was 

 intended to designate. I have also given the locality where each 

 species of plant was collected, that the report might acquire addi- 

 tional interest by attaching to each specimen some local association. 

 To avoid misapprehension, it is perhaps proper to say that it must 

 not be supposed, because a certain locality is indicated, that the 

 plant grows no where else in the State; on the contrary, most plants 

 have a very extensive range of growth, and there are only very few 

 which are found in some favored spots, and are met with no where 

 else, within certain circumscribed limits. 



Some few specimens gathered in the parishes west of the Missis- 

 sippi, are believed to possess sufficient diversity of characteristics to 

 consider them as new species. They are fully described, so as to 

 enable scientific botanists to recognize them by their specific differ- 

 ence, or refer them to a species previously described and named by 

 other authors. 



