Vol. 28 



No. 2 



BULLETIN 



OF THE 



TORREY BOTANICAL CLUB 



FEBRUARY 1901 



The insular Flora of Mississippi and Louisiana 



By Francis E. Lloyd and S. M. Tracy 



(With Plates 8-1 i) 



During the summer of 1900 the writers made a brief ecological 

 survey of the more westerly islands of the Mississippi Sound 

 Islands and Delta. The islands visited were Ship Island, He a 

 Pitre, Sundown Island, Sam Holmes Island, Mitchell Key, Brush 

 Island, Battledore Island, the Hog Islands, Breton Island, the Bird 

 Islands, and the Mud Lumps. The Delta proper was visited at 

 two points in the South Pass, namely, at Port Eads and at a point 

 a few miles north of that place. The field work was done during 

 the three weeks between the 10th of August and the 1st of Sep- 

 tember, at a time when the summer vegetation is at its height. 



In order that the present avowedly brief and imperfect study 

 m ay be made of definite interest, a comparison has been instituted 

 between the region here considered and the island of Ocracoke, the 

 °nly point on the coast of North America which has so far re- 

 ceived careful ecological study, and which, according to Kearney's 

 results, lies " well within the lower austral life zone in North 

 America." (5) The region here considered occurs in the longi- 

 tudinal center of the Gulf Strip of the Austro-riparian. Between 

 the two regions the difference of longitude is about thirteen de- 

 grees, of latitude five degrees. What the significance of this dif- 

 ference is will be seen the better by a comparison of the climatic 

 conditions. 



[Issued 2 Man h] * 61 



