376 ~ COMPOSITA SENECIO 
to obovate and oblong-obovate, rather long-peduncled, the margin from 
merely repand-denticulate to more conspicuously though sparingly 
toothed: heads less than 4g inch high, in a loose unequally-branched 
corymb terminating the remotely bracted stem: both disk.and ray flowers 
very light yellow. On dry wooded banks in Beaver Canon, Idaho,” 
S. Gibbonsii Greene Pitt. ii, 20. Stems stout, simple, 3 feet high or 
more, leafy throughout: leaves rather fleshy, short-petioled, 3 inches long 
deltoid-lanceolate, acute, entire or with a few irregular teeth near the base: 
heads radiate, 6 lines high, disposed in a lax somewhat dichomotous cyme: 
involucre campanulate, calyculate-bracted at base. Salt-marshes at the 
mouth of the Columbia river,’’ 
+ + Tall with corymbosely cymous and radiate heads: involucre 
setaceously few-bracteolate, campanulate or narrower: leaves nearly 
membranaceous. ; 
S. triangularis Hook. Fl. i, 332. Rather stout, glabrate, stem sim- 
ple, 2-5 feet high bearing several or somewhat numerous heads in a corym- 
biform open cyme: leaves all more or less petioled and thickly dentate, 
deltoid-lanceolate or the lower triangular-hastate or deltoid-cordate and 
the uppermost lanceolate with cuneate base: heads about half-inch high, 
involucre campanulate, mostly 25-30-flowered, the oblong-linear, rays 6- 
12. In wet ground on the high mountains, British Columbia to Califor- 
nia and the Rocky Mountaius. 
S. subvestitus Howell Eryth. iii, 35. Densely floccose-woolly through- 
out: stem simple, 1-2 feet high, from short spreading rootstocks, leafy to 
the top: leaves lanceolate, obscurely hastate, the lowest subcordate, all 
petiolate, 1-2 inches long, strongly denticulate: heads several in a close 
cyme, radiate, half-inch high, involucre campanulate, many-tlowered with 
or without calyculate setaceous bracts at base. In wet meadows,top of the 
Siskiyou mountains hear Waldo, Oregon. 
S. serra Hook l.c.. Strict, 2-4 feet high, very leafy, sometimes sim- 
ple and bearing rather few, somewhat large heads, commonly branching 
at summit, then bearing numerous corymbosely paniculate smaller heads: 
leaves 4-6 inches long, all lanceolate and tapering to both ends, sessile by 
a narrow base, or the lowest short: petioled, usually with the whole mar- 
gin thickly serrate or serrulate with very acute salient teeth: involucre 
oblong-cam panulate,20-30 flowered: rays5-8,oblong linear. Along streams, 
eastern Oregon to Idaho, Wyoming and Colorado 
Var. integriusculus Gray Syn. Fl. i, Pt. 2,386. Heads smaller, (3 or 
4 lines high) and narrower, fewer-flowered : leaves minutely serrate or den- 
ticulate or the upper entire, sometimes all entire or nearly so generally 
shorter and smaller or broader and not acaminate. Common from 
Eastern Oregon to California and Wyoming. 
+ + Stems either few-leaved or with the upper leaves reduced in 
size; the infloresence therefore naked: none with linear leaves. 
++ Tall and simple-stemmed, froma coarsely fibrous cluster of 
roots: leaves fleshy-coriaceous, all entire or barely denticulate. 
-S. hydrophyllus Nutt. 1. c. Very glabrous and smooth sometimes 
glaucous: stems robust, 2-4 feet high, strict: leaves lanceolate with strong 
midrib and obsolete veins; radical oblanceolate and stout-petioled, some- 
times a foot long and nearly 2 inches wide; upper cauline sessile or partly 
clasping: heads numerous in a branching corymbiform cyme, 5 lines high, 
short pedicelled: involucre narrowly campanulate, slightly bracteolate, its 
bracts 8-12: rays 3-6, small, sometimes none. In water or wet places, 
British Columbia to California. Along the Columbia river above the Dalles. 
