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. 

 Coeur 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. I.e. Cinereous with a fine and close pannose to 

 mentum, or glabrate: stems strict, simple, 1-2 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-lanceo- 

 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: achene* glab- 

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



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

 species, none pinnately divided. 



S. Purshiaims Nutt. 1. c. S. Howellii 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 stri ate, 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: 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 con- 

 tinent 



S. balsamitse 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. subnudns DC. Prodr. vi r 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 



