STUDIES IN THE COMPOSITX. 51 
obovoid achenes, are marks which, even in the dead and dry 
materials of the herbarium, indicate remoteness of affinity 
for that vast genus of which Aster Amellus is the type. In 
two particulars do the disk-corollas of DÆŒLLINGERIA differ 
from those of Aster. 'The distinction of tube and limb is 
much more pronounced, the slender tube expanding quite 
abruptly into an almost campanulate throat. In color also 
there is no change. The disk-flowers are from their earliest 
opening greenish white in the typical species, white in the 
next, and in the last species they are from pink to deep red- 
purple, even from the first. In Aster it should be well 
known that the disk-flowers are at first yellow, soon chang- 
ing to purple or red. The rays in Dellingeria are, I believe, 
invariably white. 
The genus with which Dellingeria should be compared is 
Linosyris, an Old World group, having similar campanu- 
lately dilated permanently white disk-corollas, but purplish 
rays, when rays are present. Its inflorescence is also cymose, 
as strictly so as in Dellingeria ; nevertheless these two are 
not likely to be combined. They are too unlike in aspect, 
and in certain vegetative characters, besides having a differ- 
ent involucre. 
The synonymy of the earlier species of Da@LLINGERIA is 
confused to a most extraordinary degree; each one of the 
specific names having been applied differently by different 
authors, in such wise that the three classic specific names, 
umbellatus, amygdalinus and cornifolius have all in turn been 
assigned to each species. And a most perplexing part of 
the bibliography is something which all authors hitherto 
seem to have ignored, namely, that Miller, even, either had 
two species of Dellingeria, or else two names for one. If he 
had two species, then what all the world has latterly been 
calling Aster umbellatus; Mill, is really A. nervosus, Mill., 
while the so-called A. umbellatus, Mill, may have been A. 
cornifolius. 
That our most eminent specialists, quoting Miller as the 
