378 COMPOSITE senecio 



slender-petioled, thin and delicate, lightly but rather evenly crenate; cau 

 line bracts very variable, from somewhat lyrate to lanceolate or subu 

 late: heads usually solitary: involucre subcampanulate, 3-4 lines high 

 of numerous broad thin bracts and one or more rather broad and her 

 baceous bractlets at base : rays 10 or more, broad and short, golden-yellow 

 Cceur d'Alene Mountains Idaho. 



++ -M- +* +«. Stems 6-30 inches high, bearing some leaves and corym- 

 bosely cymose heads : involucre sparingly calyculate or nearly naked 

 at base. 



= Leaves all entire, rarely sparingly denticulate or toothed. 



S. fastigiatus Nutt. 1. c. Cinereous with a fine and close pannose to 

 men turn, or glabrate : stems strict, simple, 1-2 feet high, terminated by s 

 fastigiate cyme of several heads, or sometimes with branches t-rminatec 

 with single and rather large heads: leaves lanceolate or spatulate-lanceo 

 late, obtuse, about 2 inches long, entire or sparingly dentate; upper oftei 

 linear; lower cauline, and the sometimes oblong, radical tapering int( 

 slender petioles: heads 4-6 lines high : rays conspicuous: achene* glab 

 rous. Plains of Oregon and Washington to Idaho and British Columbi 



= = Leaves from entire or serrate to pinnatifid in the same 

 species, none pinnately divided. 



S. Purshianus Nutt. 1. c. S. Howellii Greene. Densely white tomen 

 tose when young, tardily deciduous above : stems 4-10 inches high leafy 

 leaves thiekish the lower ones lanceolate, from nearly entire to coarseh 

 dentate or pinnatifid, slender-petioled; upper leaves pinnately lobed o" 

 parted into oblong divisions, all petioled or the uppern ost sessile : Head, 

 few to numerous, in a rather close fastigiale cyme, 6 lines high or more 

 involucre campanulate its numerous bracts lanceolate acute or acnmi 

 nate, green with white margins, minutely puberulent, the tips pubescent 

 rays 6-12, elongated oblong, 6 lines long or more : achenes glabrous, ligh 

 colored prominently striate, Rocky banks Eastern Oregon and Washing 

 ton to the Rocky mountains. 



S. aureus L. Sp. 870. Perennial, glabrous or very nearly so through- 

 out; stems rather slender, solitary or tufted, 12-30 inches high: basa' 

 leaves cordate-orbicular or reniform, crenate-dentate, very obtuse and 

 rounded, often purplish, 1-6 inches long, with long slender petioles ; lower 

 stem-leaves lanceolate or oblong, usually laciniate, pinnatifid or lyrate, 

 the uppermost small, sessile, somewhat auriculate and clasping: heads 

 several, 8-10 lines broad, 4-5 lines high, slender-peduncled, in an open 

 corymb; rays 8-12, golden-yellow; achenes glabrous; pappus white. In 

 wet places in the high mountains, Alaska to California and across the con- 

 tinent 



S. balsamitae Muhl. Wild. Sp. 1999. Stems slender, 10-20 inches high, 

 woolly at the base and in the axils of the lower leaves: radical leaves slender- 

 petioled, oblong, rarely slightly spatulate, very obtuse, narrow at the base, 

 mostly thick, crenate,' often purplish, 1-3 inches long, 3-6 lines wide, their 

 petioles and sometimes their lower surfaces persistently tomentose or woolly, 

 or glabrous throughout; lower stem leaves petioled, lanceolate or pinnatifid, 

 the upper sessile very small : heads few or several, slender peduncled, 6-10 

 lines broad, 3-4 lines high: rays 8-12: achenes usually hispidulous: on the 

 angles. Dry soil, British Columbia to Washington, Texas, Nebraska and 

 Nova Scotia.. 



S. subnudus DC. Prodr. vi, 428. Very glabrous throughout: stems 

 often decumbent at base, simple, slender, 6-10 inches high, nearly leafless 

 above and usually bearing a single head: radical leaves obovate, slender- 

 petioled, coarsely dentate; cauline very few, sessile, oblong to linear, incised 



