RyDBERG: Rocky MOUNTAIN FLORA 139 
petioles, which are slightly dilated and ciliate at the base ; blades 
broadly lanceolate, 8-15 cm. long, usually more or less serrate 
with ascending teeth, acute, glabrous or essentially so, hispidulous- 
ciliolate on the margins, rather thick ; upper leaves lanceolate, 
sessile or those of the inflorescence lance-linear ; inflorescence or 
its few principal branches racemiform ; involucres 8—g mm. high, 
I cm. broad; bracts subulate, glabrous, with linear-lanceolate 
green tips and green midveins below; rays blue or bluish purple, 
about 15 mm. long; disk-flowers red-purple ; achenes glabrous, 
at least in age. 
This may be the A. praecox of Hooker's Flora Boreali-Ameri- 
cana; but the name is preoccupied by A. praecoxr Willd. It is 
related to A. Lindleyanus, but differs in the narrower leaves, of 
which the lower are neither cordate nor broadly ovate and those 
of the inflorescence are lance-linear, in the larger rays, which are 
about 15 mm. long, and in the more ascending branches of the 
simpler inflorescence. 
ALBERTA: Along streams, edge of woods on the Sulphur 
Mountain, Aug. 16, 1899, J/cCalla 2026 (type, in herb. N. Y. 
Bot. Gard.) ; roadside, Spray Avenue, Banff, Sept. 18, 1899, 
McCalla 2027; below Wapta Lake, Aug. 6, 1904, /, Macoun 
69480; gravelly banks, Second Lake, Rocky Mountain Park, 
Aug. 3, 1891, Macoun 7770. 
“Aster Butleri sp. nov. 
Perennial, with a horizontal rootstock ; stem 4-10 dm. high, 
glabrous, slender ; lower leaves petioled ; blades lanceolate, about 
1 dm. long, distantly serrate with ascending teeth, hispidulous- 
ciliolate on the margins, otherwise glabrous ; upper stem-leaves 
sessile, narrowly lanceolate, or those of the inflorescence lance- 
linear, entire ; inflorescence paniculate with numerous heads; in- 
volucres 5-6 mm. high. about 8 mm. wide; bracts subulate, with 
green midribs and narrowly lanceolate green tips, attenuate, gla- 
brous ; rays bluish purple, 8-10 mm. long; achenes hispidulous- 
strigose. 
This is related to the preceding, but differs from it in the large 
inflorescence with numerous small heads, and in the pubescent 
achenes. In the latter respect it differs from all the species of 
the Aster Lindleyanus group. 
Montana: Gateway, Aug. 16, 1908, B. 7: Butler 443 (type, 
in herb. N. Y. Bot. Gard.); also 433. 
