990 CARDUACEAE 



drical, about 6-7 mm. high and 5-6 mm. wide; bracts narrowly lanceolate or 

 linear, thick on the back; tips not spreading, very dark, glandular and puberu- 

 lent; hgules light yellow, 6-8 mm. long; achenes glabrous. A. andinus Nutt., a 

 form with the upper leaves entire-margined. Mountain meadows: Mont. — 

 Colo .—Ore . — Wash. Plain — Moni . Jl-Au . 



20. S. lanceolatus T. & G. Stem 6-10 dm. high, glabrous; leaves lanceo- 

 late or linear-lanceolate, entire, shining, yellowish green, 1-2 dm. long; Heads 

 paniculate; involucres turbinate-campanulatej about 6 mm. high and 5 mm. 

 broad, glabrous; bracts linear-lanceolate, scarious-margined, acute, the calyculate 

 ones subulate; ligules hght yellow, 5 mm. long; achenes cylindric, glabrous, stri- 

 ate. S. serra integriusculus A. Gray, in part. Along streams: Wyo. — Nev, 

 Svbmont, Jl-Au. 



21. S. glauciifolius Rydb. Perennial, with a rootstock, glabrous or slightly 

 tomentose when young; stem 5-6 dm. high, leafy; lower leaves elliptic, coarsely 

 sinuately lobed, generally with smaller lobes on the petioles, which are somewhat 

 enlarged and clasping at the base; stem-leaves ovate or rounded-ovate in outline, 

 sessile and half-clasping, deeply cleft into oblong divergent lobes; heads many, 

 cor\Tnbose or paniculate, about 1 cm. high; involucral bracts very narrowly 

 linear, ahnost subulate; rays narrow, light yellow; achenes striate, glabrous. 

 Meadows: Mont. 



22. S. Kingii Rydb. Stem glabrous, 3-6 dm. high, rather stout, leafy; 

 leaves obovate or oblanceolate in outline, 4-7 cm. long, the lower petioled, all 



i)innately lobed one-third to one-half the distance to the midrib, with ovate or 

 anceolate, more or less toothed lobes; heads corymbose-paniculate; involucres 

 glabrous, campanulate, 7-8 mm. high, 6-7 mm, broad; ligules 5-7 mm. long; 

 achenes scabrous-papillose. Mountains: Utah. Submont. — Mont, Jl-Au. 



23. S. ambrosioides Rydb. Stem glabrous, leafy, 4r- 10 dm. high; leaves 

 lanceolate or oblanceolate in outline, pinnatifid to near the midrib or the lower 

 incised, mostly short-petioled, the lobes lanceolate, coarsely dentate or incised; 

 heads cor^Tnbose-pamculate ; bracts carinate, linear, acute, with black tips, the 

 calyculate ones subulate, 4-5 mm. long; hgules light yellow, 5-6 mm. long; 

 achenes minutely scabrous-puberulent on the angles. Mountains: Wyo. — Utah 

 • — N.M, Mont. — Subalp. Jl-Au. 



24. S. eremophilus Richards. Stem stout, 5-10 dm. high; leaves deeply 

 pinnatifid, 1-2 dm. long, the lower petioled, the upper sessile; lobes lanceolate, 

 usually toothed or cleft* heads many, corymbose, 10-12 mm. high; bracts linear- 

 lanceolate, costate, black-tipped; ligules 6-8 mm. long; achenes papillose-scabrous 

 on the angles. Wet ground: Sask. — N.D, — Wyo. — Alta. — Mack. Au-S. 



25. S. Kuntzei Rydb. Perennial, probably suffruticose below; stem 5 dm. 

 high or more; stem-leaves oblanceolate in outline, 5-10 cm. long, with a broad 

 blade above, pinnately cleft into hnear, oblong, or lanceolate lobes below the 

 middle, the upper merely toothed, those of the branches linear and entire; heads 

 numerous, cymose-paniculate ; involucres cylindro-turbinate, nearly 1 cm. high, 

 8 mm. broad; bracts Unear, acute; ligules about 1 cm. long; achenes hispidulous. 

 Mountains: Colo. — Wyo. SubmanL Jl-S. 



26. S. filicifolius DC. Stem 5-10 dm. high, slightly floccose when young, 

 soon glabrate; leaves pinnatifid, with linear-filiform divisions; heads corymbose, 

 10-12 mm. high; involucres campanulate, shghtly floccose when young; bracts 

 carinate, linear, abruptly acuminate, the calyculate ones linear-subulate, one- 

 haK to two-thirds as long; ligules 10-15 mm. long; achenes strigose-canescent. 

 S. lathyroides M. E. Jones. Sandy plains: Ariz. — Utah — Calif. Ap-N. 



27. S. Riddellii T. & G. Stem 3-10 dm. high, glabrous, leafy, branched; 

 leaves pinnatifid, wdth linear or linear-filiform divisions, glabrous; heads corym- 

 bose, 10-12 mm. high; involucres campanulate, glabrous; bracts linear, acute, 

 somewhat carinate; ligules about 12, light yellow, 9-12 mm. long; achenes some- 

 what canescent. Plains : Tex.— Neb.— Wyo.— N.M. Plain— SubmonL Je-0. 



28. S. xnulticapitatus Greenm. Stem 4-10 dm. high, yellowish, gla- 

 brous, branched and broom-like, leafy; leaves irregularly pinnately dissected into 



