992 CARDUACEAE 



linear, sessile; cyme compound, corjinbif orm ; heads small; involucre about 8 mm. 

 long, almost cylindric; bracts broadly linear, acute, about two-thirds as long 

 as the disk; hgules light yellow, 6-8 mm. long; achenes glabrous. A. lugens 

 foliosus A. Gray, in part. Subalpine regions: Utah. Subalp. Jl. 



37. S. sphaerocephalus Greene. Stem 6-10 dm. high, striate, sparingly 

 woolly when young, leafy below; lower leaves 2-3 dm. long, wing-petioled ; blades 

 firm, oblanceolate, sinuately callous-dentate, more or less tomentose on both 

 sides; upper leaves linear-lanceolate; heads in a cor>Tnbiform cyme, about 1 cm. 

 high; bracts linear, rather thick, black-tipped, much shorter than the disk; 

 h^es 8 mm. long, orange or lemon; achenes hispidulous on the angles. S. alius 

 Rydb. Wet meadows in the mountains: Mont. — Wyo. — Nev. — Ida. Mont. — 

 Subalp. Jl-Au. 



38. S. Hallii Britton. Plant densely white-tomentose; stems several, a 

 little over 1 dm. high; basal leaves 2-3 cm. long, distinctly petioled; blade spatu- 

 late, obtuse, thick, entire; stem-leaves linear, sessile; heads few, crowded, about 

 5 mm. high and as broad; involucre turbinate-campanulate; bracts broadly Hnear, 

 acute, densely tomentose; Hgules light yellow, about 5 mm. long; achenes gla- 

 brous. Geyser fonnations: Yellowstone Park, Wyo. Mont. Jl-Au. 



39. S. Purshianus Xutt. Stems 1-2 dm. high; basal leaves broadly spatu- 

 late, entire, 3-5 cm. long, obtuse; cjnne small, corymbiform; heads 2-10; involucre 

 campanulate, 7-8 mm. high; bracts linear-lanceolate, acute; Hgules bright yeUow, 

 about 6 mm. long; achenes glabrous. Dry hills and mountain sides: Sask. — Tex. 

 — Utah — B.C. Plain — Alp. Je-Au. 



40. S. larimiensis A. Nels. Stem 1-2 dm. high, floccose; basal leaves 4-5 

 cm. long, short-pet ioled; blades linear or linear-oblanceolate, entire, -white-tomen- 

 tose; stem-leaves similar, but smaller and sessile; heads 10 mm. high or less; 

 bracts Hnear-lanceolate, acute, almost glabrous, calyculate ones few, small and 

 subulate; Hgules about 5 mm. long; achenes glabrous. Scarcely distinct from 

 S. Purshianus. Dry hills: Wyo.— S.D. (Black Hills). Plain. My-Jl. 



41. S. Howellii Greene. Stem 2-4 dm. high, finely white-tomentulose, in 

 age sometimes more glabrate; lower leaves 5-15 cm. long, with slender petioles 

 longer than the blades, white-tomentulose; blades oblanceolate, entire, the 

 upper sessile, more or less pinnatifid or toothed, lanceolate in outline; heads 

 corymbose; involucres 7-8 mm. high, one-fourth shorter than the disk, glabrous 

 or nearly so; bracts linear-lanceolate, acute; Hgules 8-10, yeUow, about 5 mm. 

 long; achenes glabrous. Hillsides and banks: Mont.— n Wyo.— Ore.— Wash. 

 Suhmont.^Mont. My-Jl. 



42. S. spatuliformis Heller. Stem 3-6 dm. high; leaves mostly basal, 1-2 

 dm. long, with long jietioles; blades linear-oblanceolate, entire or undulate, floc- 

 cose, sometimes glabrate above in age; upper stem-leaves small and scattered, 

 subulate, sessile; heads in an-open corymb, about 1 cm. high; bracts Hnear, acute, 

 ahnost glabrous, yeHowish; Hgules bright yeUow, 1 cm. long; achenes glabrous. 

 S. fasligiatus Nutt., not Schwein. .S. leucocrinm Greene. Wet ground, mostly 

 near the coast: Ore.— Wash. — Ida. (ace. to Gray). Je-Jl. 



43. S. Harbourii Rydb. Stem 1-2 dm. high, striate, white-floccose, leafy; 

 basal leaves and most stem-leaves petioled, 3-10 cm. long, densely white-floccose; 

 blades oblanceolate or linear-spatulate, entire; uppermost stem-leaves sessile, 

 lanceolate, more or less auricled at the base; inflorescence corymbiform; heads 

 2-7, mostly 10-15 mm. high; bracts narrowly linear, long-attenuate, light yellow- 

 ish green and slightly floccose, the calyculate ones minute, subulate; rays bright 

 yeUow, over 1 cm. long; achenes brown, shining, glabrous, angled. Mountains: 

 Colo. Mont. — Alp. Jl-Au. 



44. S. canus Hook. Stem 3-5 dm. high; basal leaves petioled, entire, 4-15 

 cm. long, obovate or s{)atulate, thick, obtuse; stem-leaves oblong or lanceolate 

 in outHne, more or less lyrate-pinnatifid or lobed, sessile, auricled; cyme com- 

 pound, corymbose; heads generaUy many, 10-12 nmi. high; bracts narrowly Hnear- 

 lanceolate; Hgules bright yeHow, 8-10 mm. long; achenes glabrous. Dry hills: 

 Sask.— Neb.— Colo.— CaHf.— B.C. Plain— Sub mont. My-Au. 



