lege of Agriculture, who has determined most of the species of 

 Euphorbia ; to Prof. S. M. Tracy of Biloxi, Miss., Special Agent 

 of the Bureau pi Plant Industry, who very kindly sent the 

 writer a list of the plants collected by him at the station in 1903, 

 and almost a complete set of the specimens, including several 

 overlooked by the writer; and to Prof. A. G. Merrill of Rock- 

 land, Maine, who examined the lichens collected. Last but not 

 least, tiie writer wishes to tender his hearty thanks to Prof. 

 P. H. Guilbeau, the energetic director of the station, for every 

 kindness, courtesy and assistance. 



As this catalogue is intended mainly for the help t>f stu- 

 dents in the summer schools held at the station, a word should he 

 said about the books consulted in the preparation of this paper. 

 Of the two manuals of the Flora of the Southern States, Chap- 

 man's and Small's, Chapman's, the third edition of which was 

 published in 1897, does not profess to include Louisiana, and 

 though useful in some parts of the State, contains descriptions 

 o| comparatively few of the plants of Western Louisiana. Prof. 

 Small's Flora was published in 1903, and is intended to include 

 Louisiana. This is a magnificent work, and contains accurate 

 descriptions of nearly all the plants of this region, but from a 

 Louisiana point of view is extremely deficient in plant distribu- 

 tion. In fact this book, which is the latest and most complete 

 publication of the Flora of the Southern States, proves unmis- 

 takably that Louisiana is, from a phytogeographical point of 

 view, almost an unknown country. Other books of use for this 

 region are: Wood's Class Book of Botany, which professedly in- 

 cludes Louisiana and contains notes on many Louisiana plants; 

 for while Wood was at work on the book, Dr. Hale of Alexandria 

 sent him many plants from his neighborhood; Coulter's Flora of 

 West Texas, which covers this region fairly well; B.ritton and 

 Brown's Illustrated Flora-, Britton's Flora of Northern United 

 States; and Cray's Synoptical Flora. Other hooks consulted 

 on various points were: Beale's Manual of North American 

 Grasses; Mohr's Flora of Alabama; and the various publica- 

 tions of the Department of Agrostology at Washington. 



In view of the fact that the writer has made the statement 

 that Louisiana is more or less unknown botanicallv, a word 



