154 RYDBERG: Rocky MOUNTAIN FLORA 
(1869), which is antedated by Lepéi/on Raf. (1818). Hence Conyzella 
becomes asynonym. I do not think that Conyza Coulter: should be 
included in Lepti/on, 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 1 am not mistaken, Eschendbachia Moench. 
Eschenbachia Coulteri (A. Gray) Rydb. 
Conysa Coulteri A. Gray, Proc. Am. Acad. '7: 355. 1868. 
BERTHELOTIA: DC. Prodr.'s: 375. 1836. 
A sericeous composite shrub of the southwestern United States 
has been variously referred to Pluchea and Tessaria, 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 It was originally made a genus by 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 
Pluchca and Tessaria. It has evidently a congener, however, in 
the desert regions of the Orient. This was ‘described by De 
Candolle as Berthelotia. 
Berthelotia sericea (Nutt.) Rydb. 
Polypappus sericeus Nutt. Jour. Acad. Nat. Sci. Phila. Il. 1: 
178. 1848. 
Lvssaria borealis“ DC.;” T. & G. in Emory, Notes Recon. 143- 
1848. 
Pluchea borealis A. Gray, Proc. Am. Acad. 1'7: 212. 1882. 
Ximenesia exauriculata (Rob. & Greenm.) Rydb. 
Verbesina enceltoides 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. FI. 2': 332. 1884. 
The genus Safia as limited in Gray’s Synoptical Flora is 4 
rather unnatural one. The group most unlike the rest is the one 
constituting the section Platyschkuhria, which I think deserves 
generic rank. Iadopt the sectional name, although its etymology 
and form are rather bad. 
