994 CARDUACEAE 



F 



when young, soon glabrate, 5-10 cm. long; divisions obovate, usually toothed or 

 cleft; heads in a dense corymb; involucres campanulate, somewhat turbinate at 

 the base, 7-8 mm. high, only slightly shorter than the disk; bracts linear, acumin- 

 ate, the calyculate ones minute, subulate or wanting; ligules 5-6 mm. long, bright 

 yellow or orange. ^ S. Nelsonii uintahensis A. Nels. Hills and mountain sides: 

 Wyo. — Colo. — Ariz. — Ida. Submont, — Alont, My-Jl. 



53. S, multilobatus T..& G. Stems several, 2-3 dm. high, glabrous, except 

 at the leaf -axils where they are sometimes slightly floccose; leaves somewhat 

 fleshy, pinnatifid or the lower merely lyrate, loosely floccose when young, soon 

 glabrate, 4-10 cm. long; divisions obovate or those of the stem-leaves oblong, 

 toothed or cleft; heads corymbose; involucres glabrate, campanulate, 5-6 mm, 

 high; bracts linear, abruptly acuminate; ligules about 6 mm. long. Dry plains: 

 Colo. — Utah — n Wyo. Son. — SubmonL My-Jl. 



54. S. densus Greene. Stem 1.5-3 dm. high, tomentose at the base and 

 at the axils of the leaves; basal leaves petioled, 4-7 cm. long; blades oblanceolate 

 or linear-oblanceolate, serrate, thick, slightly floccose when young; lower stem- 

 leaves similar but laciniate or pinnately lobed; upper stem-leaves reduced, more 

 or less pinnatifid; heads in a small dense corymb; involucres 6-7 mm. high, 

 hemispheric, glabrous; bracts linear or oblong, abruptly acuminate, scarious- 

 margined; ligules 6-7 mm. long. S. aureus compactus A. Gray. S, compactus 

 Rydb., not Kirk. S. condensatus Rydb., not Greene. Plains: Man. — Neb. — 

 e Colo. My-Je. 



55. S. tridenticulatus Rydb. Stem very slender, 2-3 dm. high; basal 

 leaves very narrow^ly linear-oblanceolate, thick, with a slender petiole, slightly 

 3-toothed (rarely 5-toothed) at the apex or wholly entire, 4^8 cm. long and 4-5 

 mm. ^v-ide; stem-leaves linear and subentire; heads 7-8 mm. high; bracts lanceo- 

 late, acute; ligules light yellow, about 8 mm. long, 3-nerved. S, Meicalfei 

 Greene. Plains: Tex.— N.M.— Colo. Son.^SubmonL My-Jl. 



56. S. oblanceolatus Rydb. Stem short and stout, about 2 dm. high, floc- 

 cose at the base of the leaves; basal leaves oblanceolate, thick and fleshy, 4-6 cm. 

 long, obtuse, crenate, with entire long tapering bases, or the first subentire; stem- 

 leaves smular or reduced and linear in outline; heads about 8 mm. high; bracts 

 linear, acute, yellowish green, the calyculate ones minute and few; ligules 5-6 

 mm. long. Dry plains: Wyo.— Tex.— N.M.— Utah. Plain— Mont. My-Jl. 



57. S. longipetiolatus Rydb. Stem strict, 3-6 dm. high, terete; lower 

 leaves oblanceolate, 1-1.5 dm. long, with slender petioles, from serrate to sub- 

 entire, the upper reduced, lanceolate, sessile, sharply serrate, or laciniate-den- 

 tate, often amicled at the base; heads 8-9 mm. high; bracts about 20, linear, 

 acute; ligules dark orange, 4r-7 mm. long. Valleys: Wyo.— Colo. SubmonL— - 

 Mont, Jl-Au. 



58. S. Rydbergii A. Nels. Stem about 3 dm. high; basal leaves oblanceolate, 

 thick and somewhat fleshy, dentate or subentire; lower stem-leaves spatulate, 

 with a wdnged petiole, coarsely dentate; ui)per stem-leaves sessile with an auricfed 

 base; heads about 8 mm. high; bracts about 15, oblong, acute, with a broad 

 membranous margin; ligules 4-5 mm. long and 2 mm. wide, dark orange. S. 

 fulgens Rydb., not Nichols. Creek banks: Wyo.— Ida. MonL Au. 



59. S. codes Rydb, Stem 3-4 dm. high, slightly floccose below, branched; 

 lower leaves long-petioled, loosely viUous-floccose when young, in age glabrous; 

 blades thick, oval, 3-6 cm. long, 1.5-4 cm. wide, rounded or obtuse at the apex, 

 abruptly contracted below, coarsely dentate-crenate, with triangular-ovate, 

 obtuse teeth; lower stem-leaves with enlarged toothed or lobed stipule-like bases, 

 the upper short-petioled and narrower; heads many, about 1 cm. high; bracts 

 Imear, abruptly acute, 5-7 mm. long, slightly villous; ligules bright yellow, 10-12 

 mm. long, about 2 mm. vnde; achenes glabrous. Mountains: Colo. Je-Au. 



60. S. laetiflorus Greene. Stem 2-5 dm. high, slightlv floccose, soon gla- 

 brous; lowerleaves petioled, 1-6.5 cm. long; blades broadly ovate, elliptic, or 

 obovate, entire or crenate-dentate, cuneate at the base; stem-leaves l>Tate or 

 pinnately lobed, the upper semi-amplexicaul; heads 8-10 mm. hieh: involucre 



