CHORI2ANTHE. 45 



CHORIZANTHE, R. Brown. 



Revision of the Genus, and Rearrangement of the Annual Species - 

 with one Exception, all North American. 



BY C. C. PARRY. 



Presented before the Davenport Academy of Sciences, January 25th, 1SS4. 



TO THE MEMORY 



Of my honored friend and instructor. 



Dr. George Engelmann, 



Of St. Louis, Mo., 



Whose botanical investig'ations, extending over half a century, have been everywhere 

 recognized as a worthy model of scientific accuracy and thoroughness; whose life 

 has been adorned by a noble manliness of character, and a most generous 

 sympathy with all associated with him in botanical pursuits; 

 this paper, written under his friendly advice, and com- 

 pleted within a few days of his decease (Febru- 

 ary 4th, 1SS4,) is mournfully dedicated. 



PRELIMINARY OBSERVATIONS. 



Since the elaboration of the genus ChorizaJithe by Torrey and Gray, 

 in Proc. Am. Acad., Vol. VIIL, pp. 192-99, and the more recent 

 publication, by Mr. Sereno Watson, in the Botany of California, 

 Vol. II., including twenty-seven species, there would seem to be 

 Httle left for less competent gleaners in this limited botanical field. 

 An unexpectedly prolonged stay on the Pacific coast, including the 

 years 1880-83, with unusual traveling facilities granted by the rail- 

 road officials, as well as the aid afforded by obliging correspond- 

 ents, has accumulated in the hands of the writer a large amount of 

 material especially rich in this almost exclusively Cahfornian genus. 

 In endeavoring to put this material into systematic order, I found that 

 preceding writers (owing to the scantiness of material, or the distrac- 

 tion of other absorbing studies) had apparently overlooked some im- 

 portant characters, that seemed essential for the proper arrangement 

 of this recently enlarged genus into natural groups and sections. In 

 following out the idea thus suggested, the writer was induced to occupy 



