MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 4OI 



cm, long, more or less hirsute, acute, tapering into a winged petiole, 

 which is, as well as the leaves, ciliate-margined : upper leaves 

 lanceolate, sessile, more or less clasping ; heads more or less corym- 

 bose, 7-10 mm. high and 1.5-2 cm. in diameter; bracts linear- 

 acuminate, minutely glandular and somewhat hirsute ; rays blue, 

 very numerous, rather narrow, about twice as long as the disk; 

 achenes strigose ; pappus double, the outer of few short setose- 

 squamellale hairs. 



A near relative of E. speciosus, viacranthus and stibtri'nervis. 

 From the first tw^o it differs in the more hairy stem and leaves, and 

 the stricter habit. The involucre is intermediate between the two, 

 and perhaps more like that of JE. subtrinervis^ from which it is 

 distinguished by its narrow leaves which are very rarely 3-nerved. 



Montana: Jack Creek, July 14, 1897, Rydberg & JBessey, 5095," 

 Indian Creek, July 21, ^og6. 

 Erigeron asper Nutt. Gen. 2: 147 [111. Fl. 3: 385] ; Erigeron gla- 



beUiis^yxXX. I. c. [Syn. Fl. i^ : 209; Man. R. M. 169]. 



Hillsides, up to an altitude of 2500 m. 



Montana: Priest's Pass and Upper Flathead River, 1883, Canby, 

 i8j ; White Sulphur Springs, 1883, Scribncr^ 100. 



Yellowstone Park : Mammoth Hot Springs, 1884, Tzvecdy, 126. 



Erigeron pumilus Nutt. Gen. 2: 147 [111. Fl. 3: 386; Syn. Fl. i^: 



210; Man. R. M. 170]. 



On dry plains, up to an aldtude of 2500 m 



Montana: Deer Lodge, 1888, 7^. W. Trapiagen; Upper Mis- 

 souri, (9<?y£'r; Trail Creek, 1887, Tweedy, 362 ; Madison Co., J/r5. 

 Flora McNitlty ; Great Falls, 1891, R. S. Williams, 344; Custer 

 Co., 1892, Mrs. Light; Madison River, 1883, Scribner, loia. 



Yellowstone Park : 1888, Dr. Chas. H. Hall. 

 Erigeron concinnus Torr. & Gray, Fl. N. Am. 2: 174 [Syn. Fl. 



i^ 210; Bot. Cal. i: 330; Man. R. M. 170]. 



On dry hills and plains, at an altitude of 1500-2500 m. 



Montana: Trail Creek, 1887, Tzvecdy, 362; Bozeman, 1887, 

 361; Philipsburg, 1892, F. D. Kelsey. 

 Erigeron trifidus Hook. II. Bor. Am. 2: 17; Erigeron composiius 



trijidus Gray, Proc. Am. Acad. 16 : 90 [Syn. Fl. 2' : 211 ; Man. 



R^ M. 170]. 



Dry mountain ranges, at an altitude of about 2000 m. 



Montana: Woodruff's Falls, Upper Marias Pass, 1883, Canby, 

 178. 



