STUDIES IN THE COMPOSITJE. — 58 
- eornifolius, Muhl. in Willd, Sp. iii. 2039 (1803). Dellingeria 
_ cornifolia, Nees, Ast. 181 (1832).—Differs from both the pre- 
= ceding by a terete stem, with only some scabrous lines run- 
- ning down from the bases of the leaves; the involucral 
_ bracts not as numerous and broader ; inflorescence more 
- simple and corymbose. 
E 4. D. RETICULATA. Aster reticulatus, Pursh, Fl. ii. 548 
- (1814)  Chrysopsis obovata, Nutt. Gen. ii. 152 (1818). Aster 
_ obovatus, Ell. Sk. ii. 368 (1824). Dellingeria obovata, Nees, 
_ Ast. 182 (1832).—The most southerly species, and a beauti- 
ful one, but much in need of investigation, for, as here re- 
= ceived, it may be an aggregate of several. 
. Itis well known that Nees referred doubtfully to this 
. genus the plant latterly known as Aster ptarmicoides, Nut- 
- tall's Chrysopsis alba. As far as the floral characters are 
. concerned, it is more like Dollingeria than Aster, but it re- 
- eedes too far from the present group in point of habit. It is 
"avery perplexing plant, and has been such, to all real stu- 
dents of Asteracex, ever since its discovery, as the bibliog- 
_ raphy demonstrates. 
__ There is another northeast American species which might 
. more easily than A. ptarmicoides be referred to Dellingeria, 
. and that is Aster nemoralis. Nees excluded it from Aster, 
3 joining it to Galatella however, and not to Dellingeria. 
.. Itsnearer affinity, as I view it, lies with a far-western group 
: characters quite closely. The stems are as equably leafy ; 
_ the lower stem-leaves are in the same way reduced to mere 
 Scale-like bracts; radical leaves there are none; the inflo- 
Aster. But the involucre, at least in the typical species, is 
