998 CARDUACEAE 



86. S. cognatus Greene. Stem nearly scapiform, 2-3 dm. high, slightly 

 floccose; basal leaves slender-petioled ; blades obovate, with cuneate bases, 2-4 

 cm long crenate, except at the base, grayish tomentulose: loT^^er stem-leaves 

 oblanceolatc, pmnately lobed, the rest very small and bract-like; heads 2-10; 

 involucres campanulate, about 8 mm. high, shorter than the disk; bracts hnear 

 acute, searious-margined; ligules light yellow, 6-8 mm. long, over 2 mm. broad; 

 achenes slightly hispidulous on the angles. Dry lowlands and mountains : Colo. 



87. S. pentodontus Greene. Stem scapiform, 5-20 cm. high, slightly floc- 

 cose; basal leaves petioled; blades obovate, 1-4 cm. long, crenate or dentate 

 above the middle, or entire, rather thick, loosely floccose when young; stem-leaves 

 much rediiced, the lower oblanceolate, the upper subulate; heads 1-5, slender- 

 peduncled; involucres campanulate, about 1 cm. high; bracts linear-lanceolate, 

 acute, shghtly floccose below; ligules yellow, about 8 mm. long; achenes striate, 

 glabrous. Alpine mountain sides: Wyo.— N.M. Suhmont. Jl-Au. 



88 S. ovinus Greene Stem less than 1 dm. high, decumbent at the base; 

 bas,al leaves short-petioled; blades orbicular, oval or obovate, some entire and 

 some dentate; stem-leaves, at least the lower ones, lyrate-pinnatifid, floccose 

 wlien young; heads mostly sohtary, about 1 cm. high; invohicres hemispheric; 

 bracts hnear-lanceolate, acute, often purple-tinged; ligules 12-15, yellow, 7-8 

 mm. long; achenes glabrous. S. Lyallvi Klatt, not Hook. S. conterminus 

 Greenm. High mountains: Alta.— Mont.— B.C. Alp.—Subalp. Je-Au. 



loc=^fl' ^" *^^^i^ftus Rydb. Stem scapiform, about 1.5 dm. high, more or 

 less floccose; basal leaf-blades cuneate-obovate, thick, 2-3 cm. long, 8-18 mm 

 wide, loosely floccose when young, dentate above the middle, rounded at the 

 apex tapering below into the petioles; heads about 4, about 12 mm. high, turbin- 



mm. long. Mountains 



ligul 



whpr?.\-S;. .^K ti^^''^'"'. o*^''"' '^^^ *^?^ ^ '^^^ '^'gh' glabrous or tomentose 

 «In,^^f^^^/ ^^^l ^^f^^f ^~^ ''°^- ^°^S'" ^l^d^s ^hick, elliptic, entire or rarelv 

 TUt ^-toothed at the apex, with slightly winged petioles; stem-leaves re- 

 duced to small bracts; heads solitary, about 1 cm. high; bracts linear-lanceolate, 

 green or slightly purplish, equalling the disk; ligules lemon yellow, about 8 mm! 

 long; achenes glabrous. High mountains: Mont. Alp. 31. 



h\J\ ^' "^e^^enaefolius A. Gray. Stem adsurgent at the base, 1-2 dm. 

 nign, Hoccose, tardily glabrate; basal leaves numerous, petioled; blades 1-5 cm. 

 long, trom oval to hnear-oblong, entire or some sinuately 3-toothed at the apex, 

 tomentose or in age glabrate, thick; stem-leaves bract-like, linear or subulate 



corymbose 



ligules 5-9 



I, ™™-/ong; achenes glabrous. S. scaposus A. Nels., and S. perennam A. Nels.! 

 a broad-leaved form. High mountains: Wyo.—Colo. Mont.—Subalp. 



92 S. pacificus (Greene) Rydb. Stem glabrous, 6-10 dm. high, hollow; 



basal leaves petioled, 2-3 dm. long; blades thick, oblanceolate, entire or sinuate- 



aentate; stem-leaves narrowly lanceolate, half-clasping; inflorescence corymbose- 

 cymose: heads S-in mm hicU- :^,r^^.,^'„ ..^ JU.iTJ^ -i„i l r ^^ 



or oblong, scarious-margined ; achenes glabrous. S. hydrophilus pacificus Greene . 

 Wet places: Calif.— Nev.— Ida.— Wash. Je-0. 



93. S. hydrophilus Nutt. Stem 5-20 dm. high, striate, hollow, strict and 

 simple; basal leaves generally long-petioled, 13 dm. long, thick, oblanceolate 

 ana entire; stem-leaves subsessile, lanceolate, oblong or linear, the upper much 



nimierous 

 5-8 mm. br 



acute, more or less black-tipped, shorter than the disk; ligules few, light yellow' 

 about o nim. long; achenes glabrous. Swampy places: S.D.— Colo.— Calif -^ 

 li.K^. Flatn — Submont. Je-Au. 



. 94. S. hydrophiloides Rydb. Stem 6-8 dm. high; lower leaves with Ions 

 wmged petioles; blades rather thick, oblanceolate, sinuate-dentate the uppef 



N 



