136 RypBErG: Rocky MOouNTAIN FLORA 
plant. The writer made such a ruling in 1901, when he raised 
A. Richardsonii, var. gigantea to specific rank. But it is evident 
from Richardson’s description that his A. sonxtanus characterized 
rather the more villous-tomentose plant. Not only was Sprengel’s 
A. Richardsonii based upon A. montanus Richardson, but his 
description also characterizes Hooker’s var. gigantea. 
The synonymy of the more southern plant is as follows : 
AsTER MERITUS A. Nelson, Bot. Gaz. 37: 269. 1904 
Aster montanus Richardson, App. Frankl. Journ. 32, in part (?). 
1823. 
Aster Richardson Hook. Fl. Bor.-Am. 2: 7. 1834. Not A. 
Richardsoni Spreng. 1826. 
Aster sibiricus A. Gray, Syn. F). 17: 176. 1884. Not A. szbiricus 
1753. 
- Aster Williamsii sp. nov. 
Perennial, with cespitose rootstock ; stems erect, about 3 dm. 
high, more or less villous; leaves oblanceolate, 3-10 cm. long, 
the lower petioled, the upper sessile, finely villous on both sides ; 
heads few in a corymbiform inflorescence; involucres 8 mm. high, 
I cm. broad; bracts linear or lance-linear, acute, sparingly and 
finely villous on the back, slightly scarious-margined below, im- 
bricate in 3 series; rays lilac, about 1 cm. long; achenes spar- 
ingly and finely pilose ; pappus tawny. 
This species is somewhat intermediate between Aster andinus 
and A. meritus. From the former it differs in the taller and more 
slender, erect stem, the finely villous leaves, the shorter, more 
numerous and more pubescent involucral bracts; and from the 
latter in the narrower leaves, which are always entire, in the com- 
paratively higher involucre, and the narrower bracts. 
WyominG: Dry hills, North Fork of Clear Creek, Big Horn 
Mountains, Aug. 12, 1898, 7. A. Williams (type, in herb. N. Y. 
Bot. Gard.); eastern slope of Big Horn Mountains, headwaters 
of Clear Creek and Crazy Woman River, July 20-Aug. 15, 1900, 
Tweedy 30 96 A, 
» Aster Macounii sp. nov. 
Perennial, with a rootstock; stem 3-6 dm. high, sparingly 
hispid-strigose, purple-tinged ; leaves thick, oblanceolate or lance- 
ate, 2-8 cm. long, hispidulous- ciliate, otherwise glabrous ; in- 
