


1901 | ROCKY MOUNTAIN PLANTS 407 
Arnica platyphylla, n. sp.— Perennial from woody rhizomes, 
3-6" high, rather slender, the internodes subequal, nearly glab- 
rous throughout, the leaves very thin and delicate in texture: 
the leaves that spring in fascicles of 3-5 from the rhizome oval 
to oval-subcordate, sinuately dentate as are also the stem leaves, 
obtuse or acute, ciliolate on the margins, 4-6™ long, equaled 
by the slender petioles: stem leaves 2~4 pairs and a pair of 
sheathing scales at base, all closely sessile by broadly rounded 
or truncate base; if only 2 pairs, similar in size and shape; if 4 
pairs, the upper and the lower smaller than the two middle pairs ; 
from nearly orbicular to broadly ovate and subacute, 5-10™ 
long: heads 3—s; if three, on slender nearly equal peduncles, 
subtended by ovate-acuminate bracts 2-3°" long; if five, the 
lowest pair from the uppermost leaves and borne on elongated 
slender petioles: involucres somewhat turbinate, slightly gland- 
ular-pubescent as are also the peduncles; scales thin, narrowly 
obovate-acuminate, in one series: rays few, long, bright yellow: 
tube of disk corollas pubescent, very slender, abruptly dilated 
into a wide cylindrical glabrous throat with slender erect teeth: 
akenes narrowly linear, 5™™ long, equaling the fine white hardly 
scabrous pappus. 
This is seemingly a well marked species, occurring in the moist woods of 
the northern Rocky mountains. I have seen four collections of it as follows: 
flenderson, Cascade mountains, Oregon, July 18, 1896, distributed as A. /att- 
Jolia,;, Sandberg and Leiberg, Stevens pass, Washington, distributed as A. 
Chamissonis, August 1893; R. S. Williams (no. 443), Columbia falls, June 
18, 1894; Belt mountains, Montana, July 24, 1899. Of the latter two I cannot - 
be very certain, as they are not now at hand. This species seems nearest to 
the recently described 4. ventorum Greene (based upon one of my numbers), 
a species of which I now have several collections. 
Arnica stricta, n. sp.—Very erect with gradually tapering 
stem, 2-34" high, tomentose pubescent throughout: leaves about 5 
pairs, the lower pairs exceeding the internodes, gradually smaller 
upward, the upper half of the stem nearly naked; the lowest 
pair lanceolate, acute, 3-5 ™ long, tapering into a slender petiole 
usually shorter than the blade; the next 1 or 2 pairs similar 
but with shorter petioles; the upper and smaller pairs sessile by 
