4 Wi/son — Obscroatio7is on 



had been added to our knowledge of the plant, except what 

 was implied in Wallroth's separation of it from the genus 

 Orobanchc, where it had been placed by Linneus, and its erec- 

 tion into a separate genus Conopholis, in 1825. Of this genus 

 it was the solitary species until Sereno Watson described a 

 second, Conopholis mcxicana. 



In 1892, it is true. Dr. Chatin published his work on Para- 

 sites, in which three pages of text and one of illustrations 

 lithographed from free-hand drawings, are devoted to the 

 histology of C. americana. The material with which he 

 worked, however, must have been quite scanty and young, for 

 a careful study of the fine anatomy of the plant shows that in 

 most instances his statements and drawings do not conform to 

 conditions in the adult plant. The details of the many points 

 of difference will be given later on. Material for the present 

 study was collected by Professor Macfarlane in the Allegheny 

 Mountains, near Gallitzen, during June of 1896, and my 

 investigations have been made under his direction. 

 II. Geographical Distribution. 



Co7iopholis americana, as its specific name indicates, is a dis- 

 tinctly American plant. It is not very commonly found, but 

 has rather a wide distribution. Gray says in the last edition 

 of the "Manual," "New England and Michigan, south to 

 Florida and Tennessee, May and June." 



The following more exact information is due to the kind- 

 ness of several botanists to whom I desire here to make 

 acknowledgment. 



New York. — Staten Island, Garretson's. A. A. Tyler 

 (Herbarium of Lafayette College, Dr. Thomas C. Porter). 



New Jersey. — Sussex County, near Newton. A. P. Garber 

 (Herbarium of Lafayette College, Dr. Thomas C. Portei). 



Pennsylvania. — Chester County, R. Kipington. Lancaster 

 County, Mouth of Tuequanhe, N. A. Heller. Franklin 

 County, Mercersburgh. Allegheny County, Wall's R. R., S. 

 W. Knipe. Mercer County, Middlesex, A. P. Garber. 



