436 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 



glabrous as Pursh describes it. A. alpina^ as characterized by Gray^ 

 comprises not less than five distinct species, viz., the present species^ 

 the above mentioned Labrador plant, A. fcdiincnlata R^^dberg, A. 

 fulgcns Nutt., and A. RydhcrgH QxQ,^xi^. 



Common throughout the northern Rocky Mountain region, grow- 

 ing at an altitude of from 1500-3000 m. 



Montana: Spanish Basin, June 28, 1897, Rydberg & Bessey, 

 ^222; Bridger Mountains, June 14, ^221 (type); Helena, 1888,. 

 Kelsey ; Jefferson River, 1883, Scribner, 124c. 



Yellowstone Park: 1885, T^vccdv, 682. 



* Arnica fulgens Pursh, Fl. Am. Sept. 527. 



Differs from the preceding in the more coarsely hairy stem, 

 the narrowly linear and more numerous bracts, 15-25 in number, 

 somewhat larger heads, and orange-colored rays. Last year I took 

 up the name A. fulgcns for another species, not having seen any 

 specimens like those collected this year ; the latter agree perfectly 

 with Pursh's description. It grows on hillsides, at an altitude of 

 2000-3000 m., and is a comparatively rare plant. 



Montana: Bozeman, 1882, Tzucedy, ^oy ; Columbia Falls, J/r5. 

 Kennedy, 7; Great Falls, 1886, 7?, S, Williams; Bridger Moun- 

 tains, June 12, 1897, Rydberg & Besscy, ^220. 



Wyoming: Teton Forest Reserve, 1897, Tzveedv, ^jo. 



* Arnica pedunculata Rydberg, Bull. Torr. Bot. Club, 24: 297. 



Resembles most A. monocefhola, but is a much taller plant, 3-6 

 dm. high, with a long-peduncled head, small stem-leaves, and finer 

 pubescence. It grows in open meadows, at an altitude of about 

 2000 m. 



Montana: Silver Bow Co., 1888, Tweedy, 22^; Gallatin Co.,. 

 Mrs. Alderson; Spanish Basin, 1896, Flodman, Sg<) and goo; June 

 28, 1897, Rydberg & Bessey, S~~J ^ Custer Co., 1892, Jlfrs. Light. 



* Arnica Rydbergii Greene, Pittonia, 4: 37; Arnica fulgcns Ryd- 

 berg, Bull. Torr. Bot. Club, 24: 297 ; not Pursh. 



Generally rather tall, 3-4 dm. high, striate, sparingly hirsute, 

 usually with 3 or 4 pairs of stem-leaves, and three heads. The basal 

 leaves are ovate-lanceolate with a winged petiole, sinuately dentate, 

 acute ; stem-leaves similar, sessile, with a broad clasping some- 

 times slightly dilated base. The heads are decidedly turbinate, 12— 

 15 mm. high, the bracts rather few, 8-16, lanceolate, sparingly hir- 



