MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 435 



Montana: Burke; Beaver Head Co., 1888, Tweedy, 224.; Ana- 

 conda, 1892, F. D. Kelsey ; Spanish Basin, July i, 1897, Rydbei'g 

 & Bessey, j22^. 



Yellowstone Park: Blacktail Deer Creek, 1884, Tweedy, 181 ; 

 1885, 680; Shoshone Lake, Aug. 10, 1897, Rydberg & Bessey, 

 ^224; Upper Falls, 187 1, Hay den Survey. 



Arnica eradiata (Gray) Heller, Cat. N. Am. PL 7 ; Arnica angusti- 



folia eradiata Gray, Proc. Acad. Sci. Phila. 1863 : 68 ; A. Parryi 



Gray, Am. Nat. 8: 213 [Syn. Fl. i^ 382]. 



In woods in the mountain regions, at an altitude of 1500—2500 m. 



Montana: Gallatin Co., 1886, Tzveedy, 1132; Bridger Mts., 

 1896, Flodman, 8g2. 



Yellowstone Park: East Pelican River, 1885, Tweedy, 68c/; 

 1873, C. C. Parry, 153; 1885, Letterjnan. 



* Arnica, monocephala. 



Arnica alpina Gray, Syn. Fl. l" : 382, mainly; not Olin. 



Stem generally 1.5-2 dm. high, densely pubescent, almost pilose, 

 or somewhat hirsute above, generally with two pairs of leaves and a 

 single erect head ; basal leaves broadly oblanceolate, entire, taper- 

 ing into a short petiole, obtuse or acute, 3-7 cm. long, densely 

 pubescent, 3-5-ribbed ; stem-leaves lanceolate or linear, sessile and 

 slightly clasping; head 12-15 miri- high and 12-20 mm. in diam- 

 eter; involucre densely pubescent, not villous, its bracts 10-15, 

 lanceolate, bright green; rays bright yellow, 12-16 mm. long and 

 4-6 mm. wide ; achenes densely hirsute, about equalling the cream- 

 colored pappus. 



This is the most common species in the Rock}' Mountain region 

 which has gone under the name Arnica alpina. The original A . alpina 

 is described as densely woolly, and there is no plant in America, so 

 far as I know, that fits the description. There is only one from Lab- 

 rador that is more or less villous, but that is probably not A. alpina. 

 A. angtistifolia Vahl, from Greenland is regarded by European 

 botanists as the same as A. al^ina, but this is described by Lange, in 

 his Conspectus Florae Groenlandicae, as having an involucre that is 

 much smaller than that of A. montana and is attenuate at the base. 

 The involucre of the Labrador plant is fully as large as that of A. 

 fuontana, and the onl}^ species with turbinate involucres in the alpina 

 group are A. Lessingii and A. Rydbergii, mentioned below. The 

 Labrador plant is, I think, jA.. flantaginea Pursh, although it is not 



