374 COMPOSIT A | ARNICA 
SENECIV 
A. longifolia Eaton Bot. King 186. Minutely scabirous-puberulent: 
stems 14-24 inches high, many froma scaly caudex: leaves in 5-6 pairs. elon- 
gated-lanceolate, acuminate, 7-10 lines broad, entire or denticulate, the very 
lowest reduced to ochreate scales, the upper pairs sessile and slightly conna- 
te-amplexicaul, the lower with sheathing connate petioles: heads 1-8, com- 
monly 5, not large; involucral bracts lanceolate, acute: achenes minutely 
glandular but not hispid. In dense clumps among rocks, Powder River 
Mountains Oregon to the Clover Mountains Nevada and in the Uintas above 
Bear River Canyon; 10,000 feet altitude. ~ : 
A. foliosa Nutt. 1. c. Tomentose-pubescent, strict, leaves lanceolate, 
denticulate, neryese; upper partly clasping by narrowish base; lower with 
tapering base, connate: heads short-peduncled, rarely solitary; achenes jair- 
sute-pubescent or glabrate, Wet meadows and mountain sides, western Cali- 
fornia to eastern Washington the Saskatchewan and the Rocky Mountains. 
+ + Heads rayless stems leafy even on the flowering branches 
A. viscosa Gray. Proc. Am. Acad. xiii, 374. ‘*A foot or less high, fas- 
tigiately branching, very viscid-pubescent: leaves small (inch or less long ), 
ovate-oblong, entire, closely sessile but not connate at base: involucre 4 lines 
high, considerably shorter than the 25 or 30 flowers: corollas pale yellow: ach- 
enes glandular-hirsute. On Mt. Shasta California’, perhapsin Oregon. 
+ + Less leafy: cauline leaves 1 or 2 rarely 3 pairs, the upper 
mostly small. 
+» Heads rayless, mostly 3-5 and rather short-peduncled at the naked 
summit of the stem. 
A. Parryi Gray Am. Nat. viii, 213. Somewhat hirsutely pubescent 
and above glandular,slender, simple, 1-2 feet high : leaves membranaceons, 
commonly denticulate, radical oval or ovate-oblong, 1-3 inches long, ab- 
ruptly or cuneately contracted at base into a short margined petiole; cau- 
line remote: involucre hirsute and glandular, 6 lines or less high, occas- 
ionally some outermost corollas ampliate: achenes glabrous or with a few 
sparse hairs. Eastern Oregon and Washington to the Rocky Mountains. 
++ ++ Heads conspicuously radiate, solitary or very few, mostly 
long-peduncled. 
A. alpina Olin. Pubescent,. hirsute or at summit villous: stems 18 
inches high. strict, simple,usually monocephalous: leaves thickish,from 
narrowly oblong to lanceolate, or the radi al oblong-spatulate and small, 
uppermost linear entire, or denticulate, 3-nerved; base of the cauline bare- 
ly at all connate: achenes hirsute-pubescent, rarely glabrate. Oregon and 
Washington to the Aleutian Islands, the Rocky and Sierra Nevada Moun- 
tains Labrador and the Arctic coast 
++ ++ Pappus of soft-capillary and merely scabrous very nu- 
merous bristles. Style-branches narrow, truncate or cvapitellate and 
often bearing a bearded ring at tip which sometimes is produced into 
a short central cusp or obscure cone. Leaves all alternate. 
86 SENECIO Tourn. L. Gen, nu. 954. 
Perennial herbs; with mostly simple stems from creeping root- 
stocks, bearing solitary or few usually long-peduncled and rather 
large heads of yellow flowers. Head many-flowered, with pistillate 
rays; or sometimes homogamous by the absence of the rays; the 
flowers all fertile. Involucre usually broadly campanulate na> 
