6 LEAFLETS. 
that genus. But habitally this type is wholly unconformed to 
Dellingeria—as far from it as it is from typical Aster itself, 
It is even less repugnant to Sertcocarpus, as Nees himself observed. 
But that genus has densely silky-villous achenes, while those of 
the type in question are perfectly glabrous, white and almost 
shining as well as rather strongly quadrangular and little or 
not at all compressed. The pappus, too, is very clear white 
even in maturest age and after long years in the herbarium; 
and this is not true of any of its supposed allies. And that the 
bristles of the pappus are visibly dilated at tip is a character 
here for the first time noted. By these marks, and by its almost 
filiform disk-corollas which are always white, and the thick and 
appressed involucral bracts, it must be admitted, rationally, in 
the rank of a genus, which I purpose calling UNAMIA. 
Over and above the type species, which must be called 
U. PTARMICOIDES, the following seem specifically distinct: 
U. FASTIGIATA. Leaves narrower than in U. ptarmicoides, 
entire, marked with a pair of lateral veins more or less distinctly 
anastomosing with the not very much more conspicuous midvein, 
the surface and margins scabrous; inflorescence strict and fas- 
tigiate, flat-topped, the peduncles closely bracteolate, the bract- 
lets passing gradually into those of the turbinate involucre, 
which are acute. 
Apparently local in moist sandy lands along the southern 
shore of Lake Michigan, the best specimens by L. M. Umbach, 
at Pine, Indiana. The rays are evidently white, otherwise I 
should have suspected it to be the var. /utescens of the type 
species. The long almost imbricate-bracteolate peduncles, tur- 
binate involucres, (campanulate in U. ptarmicoides) and fastigiate 
cyme compel the recognition of this as at least a strong sub 
species. 
U. GEORGIANA. A. ptarmicoides, var. Georgianus, Gray. In 
habit like the last, but less strongly fastigiate, the cyme not 
flat-topped, the lateral peduncles quite surpassing the terminal 
head, all the peduncles strongly bracteolate and the involucre 
still more acutely turbinate, the bracts narrow and acute, 
glabrous even marginally. 
