150 PROCEEDINGS OF THE ACADEMY OF [March, 



CRATJEGUS IN PENNSYLVANIA. II. 

 BY C. S. SARGENT. 



Since the publication in the Proceedings of the Academy for 1905 

 of my paper on Crataegus in Eastern Pennsylvania a further systematic 

 study of the genus in other parts of the State has been made. The 

 results of these studies appear in the following paper. Additional 

 observations have also been made in Delaware. Chester and Monroe 

 Counties by Mr. B. H. Smith, in Bucks County by Dr. C. D. Fretz, 

 and in Berks County by Mr. C. L. Gruber. In Lackawanna County, 

 at Scranton and in its neighborhood, where the genus is largely repre- 

 sented in many distinct forms, important collections have been made 

 by Mr. A. Twining. The region surrounding Orbisonia, in Huntingdon 

 County, has been carefully explored by Mr. B. H. Smith, who has also 

 collected for several seasons near Bedford in Bedford County, near 

 Altoona in Blair County, and at Wilmore and Portage in Cambria 

 County. Prof. O. E. Jennings has placed at my disposal very large 

 collections accompanied by valuable notes made by him and his wife 

 near Pittsburg, in Allegheny County, and in Washington, Westmore- 

 land and Armstrong Counties. Without the assistance and careful 

 observations of all these collectors the publication of this paper would 

 have been impossible. 



To Mr. Smith I am under special obligations. He has been my 

 guide and companion during a number of journeys made during the 

 last five years through many of the Crataegus fields of the State; he 

 has enriched his specimens by the most carefully prepared notes and 

 with excellent sketches of the fruit of many species, and he has been 

 a constant and untiring adviser during the preparation of this paper, 

 which has occupied my attention for several years. 



The field is by no means exhausted; a large part of the State has 

 never been visited by careful observers of Crataegus, and in the regions 

 where the genus has been the most carefully examined, plants occur 

 which are still imperfectly known ; and before it is possible to prepare 

 a third paper on the Crataegus of the State, collections must be made 

 over large territories, and these collections, it is to be hoped, will not 

 be long delayed. 



