AND GENERA OF PLANTS. All 
panulate, sparingly bracteolate; sepals about fifteen, linear, carinate, not spha- 
celous; rays oblong, short, six to eight, about the length of the short involu- 
crum; achenium smooth; pappus much shorter than the florets. ee 
Has. The plains of Oregon, near the outlet of the Wahlamet. A remarkably tall and robust — 
species, from three to five feet high, above nearly naked and without a branch, except the F 
divisions of the corymb, which may contain from forty to fifty capituli, all in one fastigiate el r 
Involucrum brownish, short and rigid, the sepals with pubescent tips. Allied to S. lugens, but 
with smaller and more numerous capituli, and fewer rays, the upper stem leaves are also those 
which are most divided, instead of being entire. The stem and upper leaves are sometimes almost 
hoary with rough white hairs, never arachnoidly pubescent. 
Senecio * cordatus; 21, more or less hirsute, particularly the lower part of the 
stem ; stem tall and robust, subcylindric, and angularly grooved; corymb many- 
flowered, nearly simple; lower leaves cordate-ovate, nearly entire, or repandly 
serrulate, obtuse, long petiolate; stem leaves lanceolate, amplexicaule, serrate ; 
involucrum campanulate, rather small; sepals linear, carinate, about fifteen, 
with black, pubescent, sphacelous tips; rays five or six, oblong, about the 
length of the involucrum; achenium smooth, pappus a little shorter than the 
florets. 
Has. Alluvial situations in Oregon, near the outlet of the Wahlamet; rather rare. With the 
preceding: flowering in June. About two and a halfto three feet high. ‘The capituli comparatively 
small, twenty to thirty in a slightly divided corymb; pedicels and base of the involucrum sparingly 
bracteolate; involucrum smooth. The stem appearing naked from the sudden diminution of the 
leaves: the radical two to three inches broad, by three to four long, sometimes nearly entire, at 
other times very regularly crenate. Allied to the preceding, but with a smaller and nearly simple 
corymb, and the leaves at the base of the stem nearly as broad as long. 
Senecio *hydrophilus; 21, very smooth and robust, erect; stem cylindric, 
fistulous and grooved; leaves lanceolate, nearly entire, or repandly denticulate ; 
cauline amplexicaule, acuminate; capituli bracteolate, paniculate; branchlets 
subfastigiate, the corymbuli contracted, thyrsoid; involucrum small, subcam- 
panulate; sepals about twelve, linear-lanceolate; rays about six, narrow, shorter 
than the involucrum; achenium smooth; receptacle deeply alveolate, fim- 
brillate. 
Has. By the margins of ponds and springs in wet places, in the Rocky Mountains, by Ham’s 
Fork of the Colorado of the West. Leaves very smooth and rathet thick, very much like those of 
Solidago limonifolia. Stem about two feet high. The root presenting an abrupt crown with 
circles of thick fibres. Lower leaves narrowed below, with wide sheathing sal an inch to one 
and a half inches wide, the petiole six to seven inches long; stem leaves gra ually” 
