202 BOTANICAL GAZETTE [SEPTEMBER 
This species occurs on wet bottom lands in the edges of copses of under- 
shrub. Typical collections of it are nos. 766 and 1195, Wind river, Wyoming, 
Aug. 1894, by Weé/son ; no. 5224, Shoshone lake, Aug. 1897, by Rydberg & 
Bessey ; no. 6403, Snake river, Aug. 1899, by Nelson &» Nelson; Silverton, 
Colo., July 1898, by C. S. Crandad/ (distributed as A. longifolia). 
Arnica polycephala.— Nearly allied to and much resembling 
A. longifolia Eaton, but larger than that species, forming larger 
and denser clumps, the stems very numerous: leaves lanceolate, 
less acuminate than in A. longifolia, glabrous or obscurely granulo- 
glutinous: heads moderately large, very numerous (20-50) on 
each stem which is paniculately branched above. 
This might possibly be considered only a variety, but it is at once dis 
tinguished from its ally by the absence of the puberulence of that species, by 
the less acuminate leaves, and the several times more numerous heads. 
It was found growing in great masses among the rocks of the slides, of 
the steep cliffs overlooking Snake river near the southern boundary of Yellow 
Stone park. The type is no. 6422, Aug. 12, 1899. 
Arnica exigua.—Low, 1-2°" high, sub-cinereous hirsute 
pubescent throughout, with an obscure granular glutinosity 
beneath: stem erect, corymbosely paniculate-branched from the 
base upward; the branches ascending, often a pair from each 
node, each bearing one or two heads: leaves mostly lanceolate, 
acute; the two or three pairs on the main stem 5-8™ long, al 
sessile; those on the branches similar but smaller: heads of 
medium size, involucral bracts oblong, sub-acute, nearly equal- 
ing the disk which is 1o—15™™ high; rays in well developed heats 
twelve or more; akenes very narrow and tapering to the base, 
nearly glabrous, 
ee is a species of unusual habit. It has the appearance 0 see 
me - aid ey after being browsed off and 7 gorge that 
aie ota ag . and of the gaehipee i ee itis a2 
ally of A. foliosa Nutt of ne . ape uae he = deformed state 
“s ich I at first suspected it being 4 
fa plant which 
The habitat of the two is different. 4. foliosa is found on the fertile soils 
wet bottom lands, rus 
: blu 
The specimens of A. exigua were secured on the higher, dry a g. 2h 
and 
I 
; ridges overlooking Yellowstone lake. The type is no. 6949 
99- 
