1 54 Rydberg : Rocky Mountain flora 



( 1 869), which is antedated by Lcf^tilon Raf. ( 1 8 1 8). Hence Coiiyzdla 

 becomes a synonym. I do not think that Convza Conltcn should be 

 included in Lepti/oii, 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, Esclicnhacliia Moench. 



Eschenbachia Coulteri (A. Gray) Rydb. 

 Conyza Coitltcri A. Gray, Proc. Am. Acad. 7: 355. 1 868. 



BERTHELOTIA DC. Prodr. 5 : 375. 1836. 

 A sericeous composite shrub of the southwestern United States 

 has been variously referred to PhicJica and Tcssana, but is rather 

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 It was originally made a genus by 

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

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

 PlucJica and Tcssaria. It has evidently a congener, however, in 

 the desert regions of the Orient. This was described by De 

 Candolle as BcrtJiclotia. 



Berthelotia sericea (Nutt.) Rydb. 

 Polypappits scriccus Nutt. Jour. Acad. Nat. Sci. Phila. II. I : 



178. 1848. 

 Tcssaria horcalis "DC.;" T. & G. in Emory, Notes Recon. 143. 



1848. 

 Pluihca borcalis h. Gray, Proc. Am. Acad. 17: 212. 18S2. 



Ximenesia exauriculata (Rob. & Greenm.) Rydb. 

 ]\Tbcsina cncclioidcs exauriculata Rob. & Greenm. Proc. Am. 

 Acad. 34 : 544. 1899. 



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

 Schk/ihria § PlatyscJikuhria A. Gray, Am. Nat. 8: 213. 1874. 

 Bahia § Plaiysclikuliria A. Gray, Syn. Y\. 2' : 332. 1884. 



The genus Bahia as limited in Gray's S}'iioptical Flora is a 

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

 constituting the section Platysc/ikuhria, which I think deserves 

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

 and form are rather bad. 



