THISTLE rA:MILY 995 



campanulate ; bracts thickish, at first slightly tomentulose; ligules pale yellow; 

 achenes glabrous. Meadows and open slopes; Ore. — Ida. — Nev. — Calif. Suh- 

 mont. Je-Au. 



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

 leaves rounded-obovate, sinuately dentate, sometimes more or less lyrate, their 

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

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

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

 about 5 mm. long. 5. Joncsu Rydb. Moimtains: 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. aurellus Rydb. Valleys: Colo.— N.M.— Utah. 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 petioles, 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. Submont. 



— 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 Imear, 

 acute; ligules about 5 mm. long; achenes glabrous. Mountains: ^^yo.— ^.M. 

 Submont. — Mont. Au. 



■ 65 S cymbalarioides Xutt. 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 lyrate-pinnatifid, the upper reduced sessile lobed or 

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

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

 acbenes glabrous. S. aureus borealis A. Gray. Mountain meadows: Mack.— 

 N M.— Utah— B.C. Mont— Alp. Je-Au. 



G6 S Dseudaureus 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. 

 hS- involucres hemispheric ; bracts lance-hnear, acute; ligules bright yellow, 

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

 !-S D (Bkck Hiils)-N.M.~Calif.-B.C. Submont.-Alp. Je-S. 



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

 .nmpwhat angled- basal leaves 6-10 cm. long, slender-petio ed; blades obovate 

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

 .-u^fLS' lobed or divided, with rounded lobes; upper stem-leaves broadly 

 P^ \ fn' mithne sessile p3e y divided into broadly oblong or cuneate divi- 

 oyate i^ «utl«;«' more ^^ l«s^ keenly sinuate-dentate; heads about 8 mm. high; 



SstSriaSaTe^^^^^^^^^ --• l^^'" 



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



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



68. S. °^^^;^^ H';^"|l„ oval gradually tapering into the petioles, but some- 



rvl°?fAnca?e a? ?he b^e f obtusf, cJenat'e orVulte, light green; lower stem- 



tunes truncate ai me ly'^ „„^ rv^f,-nlpH the unix^r lanceolate or linear and 



leaves objanceo ate m outhne and^^^^^^^^^^ ^^^^^ 7_g 



sessile, all t^vljm-jtf^;-f-^ pale ye&, about 6 mm. 



