THISTLE FAMILY 995 



campannlate ; bracts thiokish, at first slightly tomentulose ; ligules pale yellow; 

 achenes glabrous. Meadows and open sloj)es: Ore. — Ida. — Nev. — Calif. Sub- 

 inont. Je-Aii. 



61. S. rubricaulis Greene. Stem about 3 dm. high, slender, terete; basal 

 leaves roimded-obovate, sinuately dentate, sometimes more or less IjTate, their 

 petioles often tinged with red; stem-leaves oblanccolate in outline, pinnatifid, 

 with oblong segments, generally short -petioled; heads about 8 mm. high; bracts 

 12-15, lanceolate, acuminate, as long as the disk, membranous-margined; ligules 

 about 5 mm. long. 5. Jo«esu Rydb. Mountains: Utah — wWyo. — Nev. Mont. 

 — Subalp. Jl-Au. 



62. S. mutabile Greene. Stem striate, 4-.5 dm. high; basal leaves spatulate 

 or cuneate, dentate-serrate, about 5 cm. long, with short petioles, soon glabrous; 

 lower stem-leaves long-petioled, cuneate or spatulate, lyrately lobed, the upper 

 narrowly oblanceolate and subsessile, slightly auricled at the base; heads about 8 

 mm. high; bracts 12-16, glabrous, yellowish green, lanceolate, thin; ligules golden 

 yellow, .5-6 mm. long. S. auirllus Rj'db. VaUeys: Colo. — N.M. — L'tah. Sub- 

 mont. — Mont. Je. 



63. S. subcuneatus Rydb. Stem 3-4 dm. high; basal leaves about 5 cm. 

 long, spatulate or cuneate, dentate or serrate above the middle, tapering into 

 short i>etioles, rather thick; lower stem-leaves narrowly cuneate, short-petioled, 

 dentate at the apex, the upper ones linear and sessile, often sharply dentate; 

 heads about 8 mm. high; bracts about 15, lanceolate, acute, shorter than the disk; 

 ligules 4-5 mm. long; achenes glabrous. In meadows: Colo. — Wyo. Submorit. 

 — Mont. Je-Jl. 



64. S. acutidens Rydb. Stems several, about 2 dm. high, angled, more or 

 less tinged with red; lower leaves about 5 cm. long, thick, fleshy and somewhat 

 glaucous, obovate or spatulate, sharply dentate above the middle, at the base 

 abruptly contracted into slender petioles, the upper reduced, linear, laciniate- 

 dentate or somewhat pinnatifid; heads 8-10 mm. high; bracts broadly linear, 

 acute; ligules about 5 mm. long; achenes glabrous. Mountains: Wyo. — N.M. 

 Submont. — Mont. Au. 



65. S. cymbalarioides Nutt. Stem 2-3 dm. high; basal leaves petioled; 

 blades obovate or obovate-cuneate, 2-5 cm. long, crenate above the middle; 

 lower stem-leaves similar or IjTate-pinnatifid, the upper reduced, sessile, lobed or 

 toothed; cyme corymbiform; heads 7-9 mm. high; involucres hemispheric, 6-7 

 mm. high; bracts broadly linear, acutish; ligules 6-8 mm. long, bright yellow; 

 achenes glabrous. S. aureus borealis A. Gray. Mountain meadows: I\iack. — 

 N.M.— Utah— B.C. Mont.— Alp. Je-Au. 



66. S. pseudaureus Rydb. Stem 3-8 dm. high; basal leaves long-petioled; 

 blades thin, broadly ovate or subcordate, serrate, 3-7 cm. long; stem-leaves 

 more or less laciniate or lyrate-pinnatifid, the upper clasping; heads 8-10 mm. 

 high; involucres hemispheric; bracts lance-linear, acute; ligules bright yellow, 

 about 8 mm. long; achenes glabrous. S. Burkei Greenm. Wet meadows: Mack. 

 — S.D. (Black Hills)— N.M. —Calif .—B.C. Submont.~Alp. Je-S. 



67. S. platylobus Rydb. Stem about 4 dm. high, rather leafy, striate and 

 somewhat angled; basal leaves 6-10 cm. long, slender-petioled ; blades obovate 

 or broadly oval, sinuately crenate-dentate, thin; lower stem-leaves oblanceolate, 

 petioled, deeply lobed or divided, with rounded lobes; upper stem-leaves broadly 

 ovate in outline, sessile, pinnately divided into broadly oblong or cuneate divi- 

 sions, which are more or less deeply sinuate-dentate; heads about 8 mm. high; 

 bracts broadly lanceolate, acute, membranous-margined; ligules 6-7 mm. long; 

 achenes glabrous. Wet banks: Wyo. — Utah^Ida. — Alta. Je-Au. 



68. S. flavulus Greene. Stem 3-4 dm. high, striate, pale; basal leaves 3-8 

 cm. long, obovate or broadly oval, gradually tapering into the petioles, but some- 

 times truncate at the bases, obtuse, crenate or sinuate, light green; lower stem- 

 leaves oblanceolate in outhne and petioled, the upper lanceolate or linear and 

 sessile, all deeply pinnatifid, with narrow, oblong or linear segments; heads 7-8 

 mm. high; bracts linear, acute, yellowish green; ligules pale yellow, about 6 mm. 



