142 Rydberg: Rocky Mountain flora 



Mackenzie Tekr. : Slave Lake, Richardson ; Wooded Coun- 

 try, Richardson ; Mackenzie River 1 86 1-2, Kennicott; Fort Reso- 

 lution, 1 86 1-2, Onion, Kennicott & Hardisty. 



Saskatchewan: 1857-8, E. Bonrgean. 



Montana: Gateway, Aug. 17, 1908, Butler 477, 473, and 

 434.; Helena, Aug. 16, 1892, Kelsey. 



Aster junciformis sp. nov. 



Aster juncens Coulter, Man. 161, in part. 1885. 



Aster longuhis Rydb. Fl. Colo. 356. 1906. Not Aster longulus 



Sheldon. 1894. 



Perennial, with a slender horizontal rootstock ; stem slender, 

 3-5 dm. high, simple below, with pilose lines or wholly glabrous 

 below ; leaves narrowly linear, 4-8 cm. long, 2-4 mm. wide, 

 scabrous-ciliolate on the margins, light green; inflorescence 

 corymbiform, with the rather few heads terminating the stem 

 and leafy branches ; involucres about 6 mm. high, about 1 

 cm. broad ; bracts glabrous, erose-ciliolate ; the inner bracts 

 linear, acute, with green midrib and green lanceolate tips, the 

 outer oblong or somewhat oblanceolate, obtuse, and often almost 

 wholly green ; rays white, 6-8 mm. long ; achenes sparingly hairy 

 or nearly glabrous. 



This has been known under the name oi A. junceus in nearly 

 all western botany, but differs in the always white rays, the sub- 

 corymbose inflorescence, and the broader bracts. In the eastern 

 A. junceus the bracts are narrowly linear or linear-subulate and the 

 rays are always described as light purple. 



Montana : East Gallatin Swamps, July 24, 1 896, Flodman 



833 (type. in nerb - N - Y - Bot Gard.). 



North Dakota: Butte, Aug. 5, 1906, Lunell. 



South Dakota: Custer, Aug. 15, 1892, Rydberg 773. 



Colorado: West Cliff, 1896, Shear 34.63, 3817 ; Twin Lakes, 

 Clements 388 and 379. 



Minnesota: Minneapolis, 1891, G. B. Aiton ; Hennepin 

 County, 1890, Sandberg. 



Saskatchewan: Cypress Hills, 1880, /. Macoun ; Lake 

 Manitou, July 23, 1906, Macoun & Herriot 77032; also Bear 

 Hills, July 29, 77031. 



Alberta: Five miles west of Battle River, 1906, Macoun & 

 Herriot 77033 ; also Grattan Creek, Aug. 16, 77030. 



