304 Carduaceae 



Somewhat hairy, stem simple 

 Arnica 

 cordifolia or sparingly branched, 1-2 feet 



Hook high. Leaves hairy, the basal 



Heart- ovate or orbicular, obtuse or 



leaved acute, deeply cordate at the base, 



dentate, 1-3 inches long with 

 slender sometimes margined petioles; stem 

 leaves in 1-3 pairs, ovate or oblong, sessile 

 or short- petioled, much smaller. Heads 

 1-8, 2-3 inches broad, bracts of the involucre, 

 acute or acuminate, J-f of an inch long; 

 rays 12-16, deep yellow, an inch or more 

 long, toothed at the apex; pappus white. 



In woods and thickets at the lower altitudes 

 throughout the Rockies; flowering in June. 



Smooth, slender and branched 

 Arnica 



gracilis 6-12 inches high. Leaves with 



Rydb. short glandular hairs on both 



surfaces or smooth, the basal 



broadly ovate, petioled, dentate, 



3-ribbed; stem-leaves about 2 pairs, similar, 



the upper sessile. Heads several on slender 



glandular peduncles, disc \ an inch or less 



