IX. A BOTANICAL SURVEY OF PRESQUE ISLE, ERIE 

 COUNTY, PENNSYLVANIA. 1 



By Otto E. Jennings. 



(Plates XXII-LI.) 



Introductory. 



The peninsula .of Presque Isle at Erie, Pennsylvania, is in many re- 

 spects one of the most interesting localities in the western part of that 

 state. To the botanist it affords unexcelled opportunities for collecting 

 and for field-studies, and, indeed, there is probably nowhere else about 

 Lake Erie a locality, where undisturbed vegetation may be studied as 

 at Presque Isle. 



Detailed studies of the bird-life of Presque Isle having been made 

 under the auspices of the Carnegie Museum,^ it was determined that 

 the plant-life of the peninsula should also be investigated. Ac- 

 cordingly the writer made a series of trips to the place, collecting and 

 making field-studies on the following dates : May 15-17, June 9-11, 

 and August 24-26, 1905 ; May 8-10, June 5-7, and September 20- 

 22, 1906. The collections thus made were critically studied in the 

 laboratory, as were also the collections in the Herbarium of the Car- 

 negie Museum made at Presque Isle by Professor Gustave Guttenberg 

 in 1878-1880, while connected with the Erie High School ; and the 

 collections made on Presque Isle by Dr. John A. Shafer, September 

 9-1 1, 1900, while connected with the Carnegie Museum. 



The hearty thanks of the author are here due to Dr. W. J. Holland, 

 the Director of the Carnegie Museum, for his ready approval of the 

 plans of the author in this work and for his editorial supervision of the 

 manuscript ; to the United States War Department at Washington for 

 permission to use certain early maps and charts of Presque Isle, and to 



' Paper presented as one of the requirements for the degree of doctor of philosophy 

 in the University of Pittsburgh. 



2 Todd, W. E. Clyde. " The Birds of Erie and Presque Isle, Erie County, Penn- 

 sylvania." Ann. Car. Mus., Vol. II, pp. 481-596, 1904. To the introduction of 

 this article the reader is referred for a brief general description of Presque Isle and its 

 larger vegetational features. 



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