﻿112 Hall: Notes on Baeria and Lasthenia 



genus of five sections, of which all except Platycarpha have been 

 considered, at one time or another, as constituting distinct genera. 

 These will now be discussed seriatim and reasons given for the 

 author's disposal of doubtful species. Field numbers are not 

 cited in this paper since many of the species are so similar in 

 appearance that they are not infrequently mixed on the sheets, 

 even by discriminating collectors. 



§ BURRIELIA 



Biirrielia was described as a genus in 1836 by De Candolle, 

 who recognized three species, the first two of which are forms of 

 the slightly earlier Baeria chrysostoma Fisch. & Mey. The third 

 is B. microglossa DC, which differs from the true Baerias chiefly 

 in its essentially cylindric involucre and subulate receptacle. 

 Burrielia hptalea A. Gray was added in 1865 but was transferred 

 to Baeria in the Synoptical Flora in 1 884, there having been dis- 

 covered in the meantime an intermediate species, Baeria dehilis 

 Greene, which, although much like J3. leptalea, had a campanulate in- 

 volucre nearly as broad as in the accepted species of Baeria. This 

 again reduced Burrielia as accepted by Gray to its third species 

 and left as its chief distinguishing character only the cylindric 

 involucre. On examining the type material of B. leptalea, how- 

 ever, I find that the involucres are narrowly turbinate and scarcely 

 wider than in B. microglossa. It is thus seen that this involucral 

 character is too variable and indefinite to be of generic value, for 

 which reason I have followed Dr. Greene's treatment and have 

 thrown all of the species here mentioned into Baeria, but have 

 retained Burrielia as a section because of the subulate receptacle 

 in the three species referred thereto. All other species of Baeria 

 possess subglobose or conic receptacles which approach the subu- 

 late shape only in starved or depauperate plants. 



§ EUBAERIA 



My second section comprises the true Baerias. The receptacle 

 is here conic and muriculate; the pubescence is hirsutulous or 

 strigose, never glandular, and the pappus when present consists 

 of mostly uniform paleae or bristles. To this section belongs B. 

 chrysostoma Fisch. & Mey., the type of the genus and by far the 



