154 Rydberg: Rocky Mountain flora 



( 1 869), which is antedated by Leptilon Raf. ( 1 8 1 8). Hence Conyzella 

 becomes a synonym. I do not think that Conyza Coitlten should be 

 included in Leptilon, which it resembles in habit but not in the com- 

 position of the heads. It has several relatives in Mexico and 

 Central America as well as in the Old World. The oldest availa- 

 ble name for these is, if I am not mistaken, Eschenbachia Moench. 



/ Eschenbachia Coulteri (A. Gray) Rydb. 



Conyza Coulteri A. Gray, Proc. Am. Acad. 7: 355. 1868 



BERTHELOTIA DC. Prodr. 5: 375. 1836. 



A sericeous composite shrub of the southwestern United States 

 has been variously referred to Pluchea and Tcssaria, but is rather 

 out of place in either genus. It was originally made a genus by 

 itself, Polypappus, by America's keenest botanist, Thomas Nuttall, 

 and I think it should have remained a genus distinct from both 

 Pluchea and Tessaria. It has evidently a congener, however, in 

 the desert regions of the Orient This was described by De 

 Candolle as Bcrthelotia. 



J Berthelotia sericea (Nutt.) Rydb. 



Poly pappus scriceus Nutt. Jour. Acad. Nat. Sci. Phila. II. I 



178. 1848. 

 Tessaria borealis "DC.;" T. & G. in Emory, Notes Recon. 143 



1848. 

 Pluchea borealis A. Gray, Proc. Am. Acad. 17: 212. 1882. 



4 



Ximenesia exauriculata (Rob. & Greenm.) Rydb 



Verbesina eneelioides exauriculata Rob. & Greenm. Proc. Am 

 Acad. 34: 544. 1899. 



PLATYSCHKUHRIA (A. Gray) Rydb. gen. nov. 



Schkuhria § Platyschkuhria A. Gray, Am. Nat. 8: 213. 1874. 

 Bahia § Platyschkuhria A. Gray, Syn. Fl. 2 l : H2. 1884. 



The genus Bahia as limited in Gray's Synoptical Flora is a 

 rather unnatural one. The group most unlike the rest is the one 

 constituting the section Platyschkuhria, which I think deserves 

 generic rank. I adopt the sectional name, although its etymology 

 and form are rather bad. 



