APPENDIX. 



doubt that many more species remain to be discovered. Some sections have been 

 very imperfectly explored, especially that portion of the county south of New Hope, 

 and north of Morrisville. The catalogue is intended as a basis upon which the bot- 

 anist may rely in his efforts to render the Flora still more complete. If this cata- 

 logue shall furnish a stimulus to the youths of Bucks county to prosecute more zeal- 

 ously the study of this delightful science, the author will feel amply rewarded for 

 the time and labor spent in its preparation. 

 Qu.^KERTOWN, P.\., June 24, 1876. 



Indigenous. Naturalized. Total. 



Phaenogams, 952 171 1123 



Cryptogams, 43 — 43 



Whole number of species and varieties. 1166 



NOTE. 



The revision of the Catalogue of the wild plants of Bucks county was under- 

 taken at the request of the author of this work. 



A period of twenty-nine years has elapsed since the publication of the first . 

 catalogue by Dr. I. S. Moyer. During this period great changes have taken place 

 in systematic botany. Many new species have been described. The Engler & 

 Prantl's system of the sequence of orders and families and a new system of nomen- 

 clature have been adopted and accepted by the majority of working botanists. 



The need therefore of a revision of our Bucks county plants was evident. Many 

 new plants have been added to the Flora, while a few names have been omitted. 



The species of Crataegus have been identified and arranged by C. S. Sargent, 

 director of the Arnold Arboretum of Harvard University. Several of his new 

 species are described from type specimens collected in the county and published 

 by him in the Proceedings of the Philadelphia Academy of Natural Sciences. 



The number of plants reported for the county have increased from 1162 in the 

 former catalogue to i5<Si. Of this increase three species, Tulipa sylvestris, Vicia 

 villosa, and Allium carinatum are new to the United States Flora. 



The Flora of Pennsylvania has also been enriched by the addition of about 40 

 species from Bucks county. 



Britton's Manual of the Flora of the Northern States and Canada, and Britton 

 & Brown's Illustrated Flora, are referred to for descriptions and illustrations of the 

 plants in this list. 



Abbreviations: — (M. C.) — ]\Ioyer's Catalogue of the Flora of Bucks county; 

 (P. Fl.)— Porter's Flora of Pennsylvania; (P. B. C.)— Philadelphia Botanical Club. 



C. D. FRETZ, M. D. 

 Sellersville, Pa., June i, 1905. 



