Shafer : Vascular Flora of Allegheny County. 15 



published revisions of a few of the more difficult groups. The order 

 of arrangement is as nearly as possible that of Gray's Manual, sixth 

 edition, selected only as a matter of convenience to those for whom 

 this list is principally intended. The writer, being in the fullest ac- 

 cord with the nomenclature of the most recent authors, all are urged 

 to acquire the " new names " at the earliest moment. To aid in this, 

 the names used in Britton & Brown's Illustrated Flora of the Northern 

 States and Canada are employed, those of Gray's Manual, where 

 synonyms, being in italics. The numbers succeeding the natural order 

 are those employed by Britton & Brown, and may serve as a guide to 

 the arrangement of an herbarium in accordance with the accepted 

 classification, the greater divisions being indicated by the Roman 

 numerals, as follows : 



I. Pteridophyta. 

 II. Gymnospermse. 



III. Monocotyledones. 



IV. Chloripetalse. 

 V. Gamopetalae. 



The arrangement will at once be understood. No attempt at 

 localizing the species is made except where it is considered rare and 

 has been found but once or twice. 



John A. Shafer. 



Explanation of the signs used in this list : 

 * The specimen is in the herbarium of the Carnegie Museum. 

 II The species has been seen by the writer, but is not in the herbarium, 

 f Reported, but is not in the herbarium. 



I The species may occur here, having been reported from a neighboring county. 

 ? Reported, but of doubtful occurrence. 



The blank space under each species is intended for the use of students of botany 

 and collectors, who may desire to insert notes, or the names of additional species. 



RANUNCULACE^ Jussieu. 



CROWFOOT FAMILY. IV-26. 



CLEMATIS Linn^us. 

 * C. Virginiana Linnaeus. Virgin's bower. 



^ C. Viorna Linnaeus. Leather-flower. 



Near Oakdale Station, June, 1873, Professor B. H. Patterson. 



