992 CARDUACEAE 



linear sessile: cyme compound, corymbiform; heads small; involucre about 8 mm. 

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

 as the disk; ligules 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 corymbiform cyme, about 1 cm. 

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

 ligules 8 mm. long, orange or lemon; achenes hispidulous on the angles. S. altus 

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

 Subalp. Jl-Au. 



38. S. Hallii Britton. Plant densely white-tqmentose; 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 linear, 

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

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



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

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

 campanulate, 7-8 mm. high; bracts linear-lanceolate, acute; ligules bright yellow, 

 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-petioled; blades linear or linear-oblanceolate, entire, white-tomen- 

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

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

 subulate; ligules 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; ligules 8-10, yellow, about 5 mm. 

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

 Submont. Mont: My-Jl. 



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

 dm. long, with long petioles; 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 linear, acute, 

 almost glabrous, yellowish; ligules bright yellow, 1 cm. long; achenes glabrous. 

 S. fastigiatus Nutt., not Schwein. S. leucocrinus 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 

 yellow, 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 spatulate, thick, obtuse; stem-leaves oblong or lanceolate 

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

 pound, corymbose; heads generally many, 10-12 mm. high; bracts narrowly linear- 

 lanceolate; ligules bright yellow, 8-10 mm. long; achenes glabrous. Dry hills: 

 Sask. Neb. Colo. Calif. B.C. Plain Submont. My-Au. 



