3'?8 COMPOSITAE 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. 

 Coeur d'Alene Mountains Idaho. 



++++++++ 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- 

 mentum, or glabrate: stems strict, simple, 1-3 feet high, terminated by a 

 fastigiate cyme of several heads, or sometimes with branches terminated 

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

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

 linear; lower cauline, and the sometimes oblong, radical tapering into 

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

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

 = = Leaves from entire or serrate to pinriatifid in the same spe- 

 cies, none pinnately divided. 



S. Purshianus Nutt. 1. c. 5. HowellU Greene. Densely white tomen- 

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

 leaves thickish, the lower ones lanceolate, from nearly entire to coarsely 

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

 parted into oblong divisions, all petioled or the uppermost sessile : Heads 

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

 involucre campanulate its numerous bracts lanceolate acute or acumi- 

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

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

 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, 13-30 inches high : basal 

 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 

 continent. 



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 tomen- 

 tose or woolly, or glabrous throughout ; lower stem leaves petioled, lanceo- 

 late or pinnatifid, the upper sessile very small : heads few or several, slen- 

 der 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, 438. 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, in- 



