374 COMPOSITAE ARNICA 



SENECIO 



mountains, Alaska to California, Utah, Colorado, Lake Superior and 

 Washington. 



A. longifolia Eaton Bot. King 186. Minutely scabrous-puberulent : 

 stems 14-24 inches high, many from a scaly caudex: leaves in 5-6 pairs, 

 elongated-lanceolate, acuminate, 7-10 lines broad, entire or denticulate, 

 the very lowest reduced to ochreate scales, the upper pairs sessile and 

 slightly connate-amplexicaul, the lower with sheathing connate petioles: 

 heads 1-8, commonly 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, nervose ; upper partly clasping by narrowish base ; lower with 

 tapering base, connate: heads short-peduncled, rarely solitary; achenes 

 hirsute-pubescent or glabrate. Wet meadows and mountain sides, western 

 California to eastern Washington, the Saskatchewan and the Rocky Moun- 

 tains. . 



■^ -^ Heads rayless stems leafy even on the flowermg branches. 



A. viscosa Gray. Proc. Am. Acad, xiii, 374. "A foot or less high, 

 fastigiately branching, very viscid-pubescent : leaves small (inch or less 

 long), ovate-oblong, entire, closely sessile but not connate at base: in- 

 volucre 4 lines high, considerably shorter than the 35 or 30 flowers : corol- 

 las pale yellow : achenes glandular-hirsute. On Mt. Shasta California, " 

 perhaps in Oregon. 



•*" "^ Less leafy: cauline leaves 1 or 3 rarely 3 pairs, the upper 



rnostly small. 



** IJeads 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 membranaceous, 

 commonly denticulate, radical oval or ovate-oblong, 1-3 inches long, ab- 

 ruptly or cunately 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 radical 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 capitellate 

 and often bearing a bearded ring at tip zvhich sometimes is pro- 

 duced into a short central cusp or obscure cone. Leaves all al- 

 ternate. 



86 SENECIO Tourn. L. Gen. n. 954. 



Perennial herbs ; with mostly simple stems from creeping root- 

 stocks, bearing solitary or few usually long-peduncled and rather 

 large heads of yell6w fl6wers. Head many-fl6wered, with pistil- 



