II. A PRELIMINARY LIST OF THE VASCULAR FLORA OF 

 ALLEGHENY COUNTY, PENNSYLVANIA. 



By John A. Shafer, Ph.G. 



After waiting a number of years for the appearance of a Flora of 

 Allegheny County, Pennsylvania, from another source, I have con- 

 cluded to supply the deficiency in a manner as comprehensive as is 

 possible with the material at present available. 



At best the present list must be regarded as wholly preliminary. 

 Nevertheless it is published in the hope that it may serve as a guide 

 to students in their systematic work, as well as an invitation to others 

 to participate in the preparation of a fuller and more perfect catalogue 

 in the near future. Collectors are accordingly urged to make full 

 records of each species wherever found. It is further hoped, and con- 

 fidently e.xpected, that all who use this list will submit to the writer the 

 lists which they make, so as to render possible the compilation of a 

 final catalogue. Those who submit such lists are also recjuested to 

 kindly accompany them with herbarium specimens, in order to insure 

 a correct identification. These specimens should, if possible, be sub- 

 mitted in duplicate ; one set to be incorporated with the herbarium of 

 the Carnegie Museum, in order to preserve a comprehensive represen- 

 tation of the species and its stations, the other set to be returned to 

 the contributor after examination, determination, and study. Due 

 credit will be given in the Museum catalogues, or future publications, 

 for the specimens donated, or submitted. Explicit data as to the time of 

 flower and fruit, (both of which should be collected), as well as the 

 location, should be made and recorded on the labels. In noting loca- 

 tion great exactness should be observed, and the collector should enter 

 upon his labels the township, and even the farm and field, and in 

 towns the name of the street and the number of the lot. Collectors 

 in neighboring counties are invited to use this list for their respective 

 districts, and likewise to submit their lists and specimens, with a view 

 to the future j^reparation of a complete catalogue of the flora of west- 

 ern Pennsylvania. 



No attempt has been made to utilize some of the quite recently 



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