408 DESCRIPTIONS OF NEW SPECIES 
to four or five inches in height. ‘There are no infertile filaments in the ray, and the pappus is 
almost pperfoctly — 
laghita * macrophylla; slightly pubescent; stem about three-flowered, with 
three pairs of leaves; radical and lower petiolate stem leaves, cordate, acute, the 
radical often obtuse, irregularly and somewhat incisely dentate, uppermost pair 
small lanceolate, semiamplexicaule, acuminate; pedicel elongated, bracteate; 
sepals linear-lanceolate, acute, about twelve, hirsute at the base; rays without 
filaments. 
Has. In the valleys of the Blue Mountains of Oregon. Stem about twelve to eighteen inches 
hie the leaves distant from each , the lowest two to three inches wide, and about the Sega 
th; the petioles longer than the leaves, which with the lower part of the stem are more or 
1a lose. Rays pale yellow, about twice the length of the involucrum. Discal florets with the 
dentures hirsutely pilose at the tips. Achenium subcylindric, hirsute; the pappus nearly plumose. 
Veins of the leaves coarsely reticulated. 
Arnica *amplexicaulis; nearly smooth; many stems from the same root; 
leaves five or six pairs, approximate, ovate, acute, amplexicaule, denticulate ; 
capituli three to five, lateral and terminal; sepals about twelve, linear-lanceo- 
late, acuminate; rays without filaments; achenium hirsute. 
Has. On the rocks of the Wahlamet, at the Falls. About a foot high, and very leafy; the leaves 
early all equal, except the uppermost floral pair: lateral branches leafy, one-flowered ; rays longer 
ait the involucrum, nearly linear, three-toothed, the teeth small; tips of the involucrum purple. 
Pappus nearly plumose. 
SENECIO. (Lessing.) 
+ Discotdal species. 
Senecio *debilis; 1, glabrous; lower leaves upon very long petioles, radical 
spathulate-oval, obtuse, entire, or incisely toothed at base, cauline few, amplex- 
‘icaule, pinnatifid; segments oblong, remote, entire or sparingly toothed, the 
upper ones with a tuft of i down at the base; corymb simple or compound; in- 
volucrum minutely bracteolate; sepals about twenty, not sphacelate; florets 
with the teeth glabrous; achenium smooth. 
Has. Plains of the Oregon, near the Wahlamet. Nearly allied to S. elongatus, of Pursh. 
Lower leaves with petioles three or four inches long, the primary ones quite entire and obs, at 
length toothed, and finally pinnatifid, with clasping auricles; umbell usually twice compoundet 
the umbells with three to five heads, the proper pedicels rather short; florets bright yellow. Lower 
leaves often n greatly resembling those of Barbarea vulgaris, the pinnatifid ones remarkable for the 
Menptinions and shortness of their lobes, which are mostly entire. 
