A FASCICLE OF NEW ARNICAS. 163 
A. RIVULARIS. <A foot or two in height, rather slender, 
with about 3 pairs of leaves and 3 heads: leaves thin, 
ascending, the lowest nearly 5 inches long including the 
petiole, oblanceolate, obtuse, denticulate; the middle pair 
nearly as long, but narrower, spatulately tapering but ses- 
sile; the uppermost much smaller, ovate-lanceolate, entire, 
sessile; all sparsely pubescent on both faces and with scat- 
tered minute sessile glands above: upper part of stem, as 
also the peduncles and involucres, sparsely hirsute, most of 
the hairs minutely gland-tipped: all the peduncles slender, 
the lateral two much longer than the terminal one: invo- 
lucres campanulate, their lanceolate acuminate bracts 
mostly uniserial: rays 10 to 12, deep yellow, not large, as 
often bidentate as tridentate: disk-corollas short, funnel- 
form, pubescent: achenes sparsely hirtellous, and with scat- 
tered sessile glands near the summit; pappus fuscous, 
subplumose. 
Subalpine stream-banks of the Powder River Mountains, 
at 5,000 feet altitude, eastern Oregon, W. C. Cusick, 1897 
(n. 1795 in my set). Related to A. subplumosa of Colorado 
and Wyoming, yet thoroughly distinct, and as far removed 
as that from any specific connection with A. Chamissonis, 
which name is printed on Mr. Cusick’s labels. 
A. BETONICHFOLIA. Dwarf, the many slender ascending 
usually monocephalous stems 3 to 6 inches high, with 2 or 
3 rather remote pairs of small sessile leaves: lowest and 
short-pétiolate leaves oval to oval-lanceolate, obtusish, 
somewhat serrate-toothed, seldom an inch long; the cauline 
less elongated, more obtuse, crenate or serrate or subentire, 
3 to 1 inch long, all glabrous beneath, or on both faces, or 
the upper face with some scattered short hairs; peduncle on 
base of involucre puberulent: involucre less than 4 inch 
high, turbinate, its broad bracts nearly uniserial, acute 
