﻿Hall: Notes on Baeria and Lasthenia 115 



and in them the bracts overlap in the usual manner of B. Fremontii; 

 only by careful dissection can one demonstrate that they are 

 sometimes lightly joined at the base. In no case do the bracts 

 form a definite cup as in the true Lasthenias. The achenes are as 

 described by Dr. Greene and exactly as in the epappose form of 

 B. Fremontii. The association of absence of pappus with glabrous- 

 ness of the achene is a common phenomenon in Baeria, where it 

 occurs in B. chrysostoma, B. hirsutula, and B. uliginosa, as well as 

 in B. Fremontii. But that Lasthenia conjugens is identical with 

 B. Fremontii, or at the most a recent natural segregate, is indicated 

 by the subglobose or dome-shaped strongly hirsute receptacle 

 and hirsutulous as well as glandular tube of the disk-corollas, 

 characters which do not occur in any Lasthenia and scarcely even 

 in any Baeria except B. Fremontii. Since the two are alike in 

 habit and in all other characters the obscure fusion of the involucral 

 bracts cannot be accepted as of specific and much less of generic 

 value. 



§ Ptilomeris 



In the section Ptilomeris, the receptacle is not muriculate, as 

 in all the preceding, but rather scrobiculate, for the achenes are 

 set into small depressions in the receptacle which remain as pits 

 after the achenes have fallen away, or it may be that the individual 

 pedicels have fused with one another so as to present an even 

 surface marked only by the depressions in their summits. This 

 section differs from the others also in the more or less evident 

 glandulosity of the herbage, and the leaves are more inclined to be 

 pinnately parted. 



In the North American Flora all hitherto described species of 

 this section are included under B. aristata (Nutt.) Coville, in 

 accordance with my reductions in an earlier account where the 

 numerous forms are treated in detail.* This is because they 

 evidently are the result of ecologic conditions or are based upon 

 pappus characters which, from garden experiments and from field 

 observation, have been found to be inconstant. That this reduc- 

 tion might become necessary was anticipated by Asa Gray as 



