276 BOTANICAL GAZETTE [APRIL 
Collected on steep mountain side at the head of the Middle Fork of Pow- 
der River, Big Horn Mountains, by Leslie N. Goodding, July 18, 1go1, no. 276. 
» Gaillardia gracilis, n. sp.—Perennial from a woody root: 
stems usually several, simple or sparingly branched, slender and 
somewhat virgate, 5—7°™ high, the upper half naked-pedunculate, 
straw-colored, striate and nearly glabrous: leaves softly and 
sparsely short-pubescent, oblanceolate in outline, 4-8°™ long 
including the margined petiole, from entire to deeply pinnatifid 
with linear or broader lobes: the bracts of the involucre moder- 
ately canescent, narrowly lanceolate-acuminate, green and the 
tips somewht reflexed: rays yellow, cuneate, deeply cleft (nearly 
divided) into broadly linear obtuse lobes: disk purplish-brown: 
the corolla-teeth short-triangular, without tip of any kind, the 
penicillate pubescence short: akenes short-turbinate, densely 
long-villous, about equaling the numerous aristiform fimbrillae of 
the receptacle: pappus of 10 narrowly lanceolate paleae, as long 
as the rather broadly tubular corolla. 
This will have to be looked upon as segregated from G. pinnatifida Torr. 
I take as typical of G. pinnatifida the plant of southern Colorado, southward 
and eastward. This is known by its almost scapose stems (the leaves being 
crowded on the crowns or at least well towards the base), by its canescent 
pubescence, and the fine purple of the disk which extends at least to the veins 
and the lower half of the ray. G. gracilis is twice as tall, with indurated 
base, leafy to the middle or above, rays wholly yellow and cleft almost to the 
disk, 
The type is no. 894. Mr. Leslie N, Goodding, Diamond Valley, Utah, in 
deep hot cafions. . 
v Arnica arcana, n. sp.—Tufted or cespitose in rock crevices, 
about 3°" high: stems slender, minutely granular-glandular espe- 
cially upward: leaves dark-green, denticulate,somewhat granular- 
glutinous; root-leaves oblong-oblanceolate, 2—4°™ long, on very 
slender petioles longer than the blade; lower stem leaves small, 
broadly oblong, sub-acute at apex, abruptly narrowed at base to 
short margined connate-sheathing petioles; middle stem leaves 
lanceolate, sessile or nearly so, 3-5°™ long; the foliar bracts 
similar but smaller: heads usually three, on subequal peduncles 
5-1o™ long; more rarely 1 or 2 smaller additional heads on 
short slender peduncles proliferous from the base of the central 
