CATALOGUE. 187 
Greenland, and from Labrador to Alaska, and southward to Colorado and 
California, Havallali range, Nevada ; 5,000 feet elevation ; June. (656.) 
Arnica Chamissonis, Lessing. Hirsute-canescent ; leaves oblong-lance- 
olate, acute or rather obtuse, entire, rarely slightly denticulate, 3-5-nerved ; 
radical and lower cauHne ones narrowed into short petioles, the rest (2-6 
pairs) sessile ; heads smaller than in the last ; involucres finely villous-pubes- 
cent ; achenia minutely hirsute. — Very near the last, into which Dr. Gray 
{PI. Hall Harhou)-, 7; 68) admits that it passes, but it is more leafy, and 
the leaves are paler or somewhat canescent. Both these species are united 
with A. montanaiw Dr. Hooker's ^^Distribution of Arctic Plants,^^ Sub- 
arctic America and Alaska to the Saskatchewan ; Oregon ; California and 
Colorado ; Carson City, Anderson. On the Truckee River, Nevada, and in 
Parley's Park and Bear River Caiion, Utah ; 4-8,000 feet elevation ; 
July. (657.) 
Arnica mollis, Hook, Mountains of New Hampshire and Northern 
New York ; Lake Superior, and Rocky Mountains of British America to 
Colorado and California, A. amplexicaulis, Nutt,, from Oregon dilfers in 
scarcely any respect. East Humboldt Mountains and Uintas, 6,500-10,000 
feet elevation ; July, August, (658.) 
Arnica latifolia, Bongard, Slightly hirsute-pubescent ; stems nearly 
1° high from a slender, creeping caudex ; leaves thin, ovate, acute, coarsely 
and sharply toothed ; the radical on long slender petioles ; the cauliue in 2-3 
pairs, all but the lowest closely sessile by a cordate base ; heads solitary, or 
with 1-2 additional ones from the uppermost axils ; involucre hairy at the 
base, glandular above, the scales lanceolate, acute ; achenia nearly smooth. -r- 
Alaska to Oregon, California, Utah, and the mountains of Colorado. Wah- 
satch Mountains ; 9-9,500 feet elevation ; July. (659.) 
Arnica cordifolia, Hook, Woolly-pubescent, in age becoming nearly 
smooth ; caudex slender, creeping ; stems 6-14' high ; leaves thin, ovate, 
entire, denticulate or even sharply toothed ; the radical ones roundish, 
deeply cordate, obtuse, on slender petioles ; the cauline in 1-3 pairs, on 
shorter petioles, less deeply cordate and more acute; the highest jniir sessile; 
heads 1-3, on long peduncles, rather large; involucres villous-i)ul)escent, the 
scales lanceolate, acute ; achenia hirsute-pubescent. — Saskatchewan to Oregon 
and Colorado; Cahfornia, (Var. discoidea, Gray,) Frequent in the East 
