THISTLE FAMILY 993 



45. S. plattensis Nutt, Stem 2-5 dm. high, loosely floccose, very tardily' 

 glabrate; basal leaves petioled, 3-10 cm. long; blades ovate or elliptic, floccose 

 when young, glabrate in age; lower stem-leaves petioled, lyrate-pinnatifid, with 

 oblong lobes, the upper sessile, reduced, linear-lanceolate in outline, pinnatifid 

 or toothed; heads corymbose; involucres campanulate, &-7 mm. high, tomentose 

 at the base; bracts lance-linear, acute, the calyculate ones minute, subulate; 

 Ugules about 8 mm. long, orange; achenes hispidulous on the angles. S. psetido- 

 toimniosus Mack.& Bush. Prairies and river valleys: wOnt. — Mo. — Tex. — Colo, 

 e Mont.— Sask. Plain, My-Je. 



46. S. neomexicanus A. Gray. Stem 2-4 dm. high, densely and loosely 

 floccose when yoxmg; basal leaves 3-8 cm. long, petioled; blades spatulate, coarsely 

 dentate, tomentose on both sides, glabrous in age above; stem-leaves very small, 

 linear-oblanceolate or linear, more or less dentate or pinnatifid; heads rather few, 

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

 tomentose at the base; bracts lance-linear, acute; ligules light yellow, 8 mm. long. 

 Mountains: N.M.— Ariz.— (? Colo.)- Son. My-Jl. 



47. S. Leonardi Rydb. Stem 4-5 dm. high, loosely floccose; lower leaves 

 petioled; blades obovate or oval, 2-6 cm. long, densely crenate, rather thick, 

 loosely floccose, or hi age glabrate, roimded at the apex, the middle ones more or 

 less lyrate-pinnatifid at the base, the upper 1-3 cm. long, lanceolate m outlme, 

 pinnately lobed and somewhat auriculate-clasping; heads in a rather dense 

 corymb; involucres somewhat turbmate and floccose at the base, 5-6 mm. high, 

 &-7 mm. broad; bracts linear, acute, carinate; hgules orange, about 6 mm. long, 

 2 mm. wide. Valleys: Utah. Jl. 



48. S. salicinus Rydb. Stems several, about 4 dm. high, simple below, striate 

 and floccose; basal leaves 5-10 cm. long, narrowly oblanceolat^, the first ones 

 subentire but most of them serrate except at the tapermg base, finely tomentose 

 on both sides in age more glabrate above; stem-leaves small, linear, sessile, den- 

 tate slightly auricled at the base; heads subumbellate, 7-8 mm. high, sUghtly 

 floccose at the base; bracts yellowish, thin, lanceolate, shorter than the disk; 

 ligules Ught yeUow, short and broad, 3^ mm. long; achenes glabrous. Moun- 

 tains: Colo. Submont Je-Jl. 



49. S. canovirens Rydb. Stem 4-5 dm. high, loosely floccose; lower leaves 



5-12 



almost 



sinuately dentate, with rather acute teeth ; cyme with erect or ascending Drancnes ; 

 involucre 7-8 mm. high, turbinate-campanulate ; bracts 12-14, oblong, linear, 

 floccose at the base and more or less viUose; ligules 5-6 mm long, at first orange, 

 in age paler; achenes glabrous. Mountams: Colo.-N. U. Suhmonl.-Mo,U. 



%0." S. Fendleri A. Gray. Stem 2-3 dm. high, floccose when young, but i^n 

 aee sometimes almost glabrate, floccose only at the axils of the leaves; leaves all 

 dSpirpinSifid, or the lower' oblanceolate, round-lobed or entire, more or le^s 

 tomentos? on both sides or glabrate above, 4-8 cm long the lower petioled, the 



S" HgTtrtom^^^^^^^^ aTtii fee bracfs lance-hnear, abrupf ly acuminata ; 

 Ses yeUow, 5 mm. long; achenes glabrous. S rosuMus Rydh^ ^™ttT I 

 SSire Sal leaves. I. Nelsonii Rydb. Mountams: ^ .M.^olo.-Utah. 



Zi^J^^V^S!o^re^%^ the lower leaves, b^h 



Lbout 7, the calycula 

 Hills and mountains: ' 



Neb. Plain— Mont. 



52. S. uintahensis (A. Nels.) Greenm 

 cose when young, soon glabrous; leaves pmi 



Stems 



