138 RypsBerG: Rocky MouNTAIN FLORA 
Plant glabrous or sparingly short-pubescent A. Lindleyanus. 
Basal leaf-blades lanceolate ; upper sem-leaves eaccaives lanceolate 
e of the inflorescence lance-line 
Heads saws ; involucres 8-9 mm. high ; rays about 15 mm. long ; 
HOWCNES A DTOUS 05 lies vaca sds vstvaceuesocsstesteccssarsesesrs socees A. MacCallae. 
Heads numerous; involucres 5-6 mm. high; rays 8-Io mm 
long; achenes hispidulous-strigose A, Butleri. 
. Aster Wilsonii sp. nov. 
Aster Lindleyanus 8B T. & G. Fl. N. Am. 2: 122. 1841. 
Perennial, with a horizontal rootstock; stem 3-6 dm. high 
often purplish, more or less pubescent with long white, curved, 
somewhat deciduous hairs ; basal leaves petioled; petioles 5-10 
cm. long, densely white-ciliate, together with the midrib ; blades 
ovate or subcordate, 5-10 cm. long, usually more or less hirsute 
on both sides, but in age glabrate, serrate, acuminate at the apex ; 
the lower stem-leaves similar; the upper lanceolate, sessile, sub- 
entire or those of the paniculate inflorescence narrowly lanceolate ; 
involucre 7-8 mm. high, scarcely 1 cm. wide ; bracts subulate, at- 
tenuate, with a green midrib which widens somewhat above the 
middle ; rays 8-10 mm. long, bluish purple; pappus tawny ; 
achenes glabrous. 
This species is related to Aster Lindleyanus and may grade into 
it, but the typical specimens are very distinct, characterized by the 
long white hairs on the petioles, midribs, and often the stem, by 
the narrower upper leaves, the smaller heads, and the more ascena- 
ing branches. 
British Corumpia: Armstrong, 1904, &. Wilson g19 (type, 
in herb. N. Y. Bot. Gard.) ; also gr, 476, and 393. 
ALBERTA: Grattan Creek, Aug. 16, 1906, Macoun & Herriot 
77073; also Edmonton, Aug. 26, 1906, 77074. 
WESTERN Ontario: Fort Williams, Sept. 7, 1889, Dr and 
Mrs. N. L. Britton and Miss Millie Timmerman. 
MACKENZIE: Fort Resolution and Mackenzie River, 1361-2 
R. Kennicott. : 
v Aster MacCallae sp. nov. 
(?) Aster praecor Lindl. in Hook. Fl. Bor.-Am. 2: 9 1834. 
Not A. praecox Willd. 1813. 
Perennial, with a horizontal rootstock; stems 3-6 dm. high, 
often purplish, glabrous up to the inflorescence, the tranches of 
which are slightly pubescent in lines; lower leaves vith winged 
