THE OTTAWA NATURALIST 



VOL. XXIII. OTTAWA, MARCH, 1910 No. 12 



SOME WESTERN SPECIES OF ARNICA. 



By Edward L. Greene. 



The names and descriptions subjoined are of species of 

 Arnica, apparently undescribed hitherto. Those placed first in 

 the series, it will be seen, are from within the Canadian boundary, 

 while others are from those parts of the Pacific United States 

 which lie contiguous to Canada. It would not be remarkable if 

 any of these should by and by be found also in some one part or 

 another of the extensive and varied Province of British Columbia. 



A. sororia. Stem solitary, a foot high or more, erect, 

 slender, firm, scarcely leafy, the whole plant with a velvety 

 appearance, but the close pubescence somewhat harsh rather 

 than soft: even the basal leaves not forming a rosette, but op- 

 posite, or in threes, narrowly elliptic-lanceolate, 2A to 3 inches 

 long, including the petiole, this long or short, both faces some- 

 what plushv-pubescent, margins obscurely and remotely serrate- 

 toothed ; proper stem-leaves in 2 remote pairs and much reduced, 

 entire, sessile; heads mostly 2 or 3 on peduncles 3 to 5 inches 

 long; involucre broad-campanulate, of 16 to 20 linear-lanceolate 

 glandular-hirsutulous bracts; ray-corollas deep-yellow, not short, 

 abruptly 3-toothed at the rounded apex; disk-corollas with 

 slender glandtilar-hirtellous tube twice as long as the somewhat 

 clavellate throat; achenes remarkably short, strigose-hispid ; 

 pappus dull-white, scarcely barbellate. 



Cascade, British Cokimlna. 30th June, 1902, J. M. Macoun. 

 No. 64987 of Canad. Geol. vSurv. Related to A. lonchophylhi. 

 Greene,which Mr. Macoun sent from the Athabasca River country, 

 as collected by Mr. Spreadborough in 1898; but this present 

 species has also certain points of seeming contact with A. pednn- 

 culafa, Rydb. of Montana; but this last is a stout comparati\-ely 

 coarse plant, alwavs monocephalous. 



A. RUBRiCAULis. Base of stem and its foliage not seen.but 

 plant large, the stem copiously leafy with an ample and thin 

 spreading foliage, the internodes dark red-purple and slightly 



