THISTLE FAMILY 999 



much reduced, lanceolate, sessile; cyme corymbiform; heads cylmdro-campanu- 

 late, about 1 cm. high; bracts linear; ligules few, light yellow, about 7 mm. long; 

 achenes glabrous. Wet places: Mont. — Ida.— Wash.— B.C. Jc-Jl. 



95. S. pereziifolius Rvdb. Stem 6-8 dm. high, glabrous, striate, some- 

 what branched above; basal leaves 2-2.5 dm. long, thin and glabrous, oblong or 

 eUiptic, with a short winged petiole, sinuately dentate, with small sharp salient 

 teeth; lower stem-leaves similar, but sessile; the upper ones linear, with entire 

 margins; cyme rather narrow; heads cylindric-campamilate, about I cm. higli; 

 bracts linear, tipped with black, much shorter than the disk; ligules fully 1 cm. 

 long; achenes glabrous. Swampy ground: Mont. SubmonL Jl. 



96. S. lapathifolius Greene. Stem glabrous, about 3 dm. high; loayoa 

 1-1.5 dm. long; lower leaves linear-oblanceolate, glabrous, denticulate, tnpenng 

 below into broadly winged petioles; upper leaves linear-lanceolate, hAlf-clatiping; 

 heads 5-10; involucres campanulate, 10-15 mm. high, with the peduncle gradually 

 thickened under the head; bracts lanceolate, thickened on the back, the calycu- 

 late ones few, linear-subulate, abnost as long; ligules about 1 cm long, narrow; 

 achenes glabrous. Mountains: Colo.— Wyo. MonL—Subalp, Jl-Au. 



97. S. crassulus Gray. Stem 2-4 dm. high, glabrous; basal leaves 8-15 cm. 

 long- blades obovate or lanceolate, acutish or obtuse, dentate or denticu ate, 

 tapering into a winged petiole; upper stem-leaves oblong, ovate, or lanceolate^, 

 sessile and clasping at the base; heads cor>Tnbose; involucre campanulate 12--lo 

 mm high and 10-12 mm. broad; bracts oblong, acute, very thick and fleshy, the 

 inner with membranous margins, slightly shorter than the disk, the calvculate 

 ones Hnear-subulate, about one-third as long; l^g^^^^ bright yell^^^^ 1 cm 

 long; achenes glabrous. Subalpine meadows: (Black Hills) S.D.^N.M.— Utah 



--Ida. SubmonL — Alp. Je-Au. 



Stem 4-6 dm. high, glabroTis; lower 



seznia 



leaves obovate, tapering into ^^inged petioles, acute, the upper oblong more or 

 less clasping by a slightly auricled base, acute or acurninae all very thin, sinu- 

 itely S ate and oftin with salient teeth- heads few; disk 12-15 mm high; invcH 

 fucres campanulate; bracts oblong, tipped with black, much shorter than the 

 ^- , '^ i.-r^, 5„„ ' „K^„f 8 ,T,m Inno-. achenes elabrous. Wet meadows: Mont. 



„v , liguL^ ^.«» , ,,— , T1 A 



Colo _Utah— Ida. Submont.—Mont. Jl-Au. 



99 S rapifolius Xutt. Stem 2-5 dm. high terete or slightly obtuse- 

 «n2d- leaves rather thin, sharply dentate or incised; blades of the lower leaves 

 SvaterbroaXoblanceolati, obtuse or acutish, 3-10 cm. long, tapering into 

 W-margined ana auricled petioles, half-clasping at the base ,• upper lea ves sub- 



EkTthfbat 'meUSifsi^^^^^ ^TSri^Sf tS 



Jl-Au. 



inn •? Scribneri Rvdb Stem stout, 2-3 dm. high, more or less villous; 



ini S intefferrimus Nutt. Stem 3-10 dm. high, striate, leafy branched 

 what fleshy; stem4eaves hnear- anceo ate sess^e so ^^^ ^^^. ^_ ^ 



■acuminate 



mvoiucres campanui^tc, *-^^-- ,. /. ,:^i™ dull yellow, about 1 cm. long 



mont. Je-Au. . ^ „ ^ e. ^ „.„,,* arachnoid-villous when young, gla- 



...}^. L^ZTlz l!'hiJ^To;av^5-,0 c. ion. .ore o. le. d«- 



