142 Rydberg : Rocky Mountain flora 



Mackenzie Terr. : Slave Lake, Ricliardsoii ; Wooded Coun- 

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

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



Saskatchewan: 1857-8, E. Bourgemi. 



Montana: Gateway, Aug. 17, 1908, Butler ^JJ, 47 j, and 

 4J4; Helena, Aug. 16, 1892, Kclsey. 



Aster junciformis sp. nov. 



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



Aster longidus Rydb. Fl. Colo. 356. 1906. V<oX. 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 i 

 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, (i-"^ mm. long ; achenes sparingly hairy 

 or nearly glabrous. 



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

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

 corymbose inflorescence, and the broader bracts. In the eastern 

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

 rays are always described as light purple. 



Montana: East Gallatin Swamps, July 24, 1896, Flodinan 

 S33 (type, in herb. N. Y. Bot. Gard.). 



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



South Dakota: Custer, Aug. 15, 1892, Rydberg yy^. 



Colorado: West Cliff, 1896, Shear j 46 j, jSiy ; Twin Lakes, 

 Clements j8S and 37 g. 



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

 County, 1890, Sandberg. 



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

 Manitou, July 23, 1906, Maconn & Herriot yyoj2 ; also Bear 

 Hills, July 29, 77031. 



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

 Herriot 7703J ; also Grattan Creek, Aug. 16, 77030. 



