Rydberg : Rocky Mountain flora 137 



florescence corymbiform ; heads solitary on branches with lance- 

 olate bract-like leaves; involucre 8-10 mm. high, 12-15 mm - 

 broad ; bracts oblanceolate, squarrose, acute and spinulose-tipped, 

 pubescent on the back and ciliate on the margins ; rays 7-8 mm. 

 long, rose-colored ; achenes strigose, pappus pinkish tawny. 



This species combines the characters of two different groups 

 of asters. It has the habit, leaves, middle-sized heads, pappus, 

 and pubescence of the bracts of Aster Nelsonii, A. griseus, and their 

 allies, but has the spinulose- or callus-tipped bracts and upper 

 leaves of A. multiflorus, A couuuutatus, etc. 



Canada : Old Wives Lake, Northwest Territory [Keewatin] , 

 July, 1880, John Macoun (type, in herb. Columbia Univ.). 



Aster Lindleyanus T. & G. Fl. N. Am. 2 : 122. 1841 



Aster paniculatus, var. 8 Lindl. in Hook. Fl. Bor.-Am. 2 : 8. 1834. 

 Dr. Gray in his Synoptical Flora* stated : "The original of 

 this species was raised by Gordon from Labrador seeds and has 

 more extended inflorescence of smaller heads than is common in 

 the wild plant." Dr. Gray evidently referred to Aster paniculatus 

 Ait. ; f however, A. Lindleyanus was not based on A. paniculatus 

 Ait., but principally on A. paniculatus, var. d of Lindley in Hooker's 

 Flora, although A. paniculatus of the same work was partly in- 

 cluded. The var. was collected by Richardson near Slave Lake. 

 Whether this plant is the same as A. paniculatus Ait. is very 

 doubtful. Aster Lindleyanus has been reported from many stations 

 in eastern North America as far south as Ohio, but the eastern 

 plant differs somewhat from that of the Mackenzie basin and the 

 northern Rockies in thinner more decidedly cordate basal leaves, 

 and in its bracts with more conspicuous green tips. As these 

 differences are hardly specific it is best to leave the eastern plant 

 in A. Lindleyanus. In the northern Rockies and the Saskatchewan 

 region there are found plants which have been referred to A. 

 Lindleyanus but which the writer thinks are distinct. They can be 

 distinguished as follows : 



Basal leaf-blades cordate or broadly ovate ; upper stem-leaves lance- 

 olate ; achenes glabrous. 

 Petioles, midribs, and usually also the stem pubescent with long 



white hairs A. Wilsonii. 



* l 2 : 182. 1884. 



-|-Hort. Kew. 3: 207. 1789. 



