1000 CARPUACEAE 



tinctly petioled, sinuate, obtuse, from oval-obovate to oblanceolate ; upper stem- 

 leaves reduced, narrowly lanceolate and sessile; heads in a dense corymb, 10-12 

 mm. high; bracts linear or linear-lanceolate, long-acuminate; ligules bright yel- 

 low, 8-10 mm. long; achenes glabrous. Wet meadows: Subarctic America 

 Mont. Ida. Submont. Subalp. My-Au. 



103. S. dispar A. Nels. Stem erect, 3-8 dm. high, sparingly crisp-hairy 

 when young; leaves thin, entire, or rarely denticulate, the lower long-petioled, 

 8-10 cm. long; blades oblong-oblanceolate or sometimes oval; upper leaves ses- 

 sile, lanceolate, the uppermost reduced; heads 5-20, corymbose, the central one 

 usually short-peduncled; bracts 7-9 mm. long, linear-subulate, long-attenuate, 

 minutely black-tipped; ligules 12-15 mm. long, 3 mm. broad; achenes glabrous. 

 Mountain valleys: Wyo. Colo. Utah. Plain Mont. Je-Jl. 



104. S. Leibergii Greene. Stem 5-10 dm. high, sparingly arachnoid-tomen- 

 tose when young, soon glabrate; lower leaves slender-petioled, 1-2 cm. long; 

 blades oval or elliptic, 5-8 cm. long, sinuate-dentate or nearly entire; middle 

 stem-leaves lanceolate or lance-linear, sessile, denticulate, somewhat arachnoid- 

 hairy when young; inflorescence corymbiform; involucres 7-8 mm. high, about 

 half as high as the disk; achenes glabrous. S. exaltatus ochroleucus A. Gray. S. 

 ochraceus Piper. Bluffs and open woods: Ore. w Mont. Wash. B.C. Sub- 

 mont. My-Je. 



105. S. exaltatus Nutt. Stem 3-10 dm. high, striate, simple; basal leaves 

 with slender petioles; blades ovate, rarely subcordate, 5-8 cm. long, sinuately 

 dentate or denticulate, acute, rounded or truncate at the base; stem-leaves 

 lanceolate, sessile, with more or less auricled bases, the upper ones much reduced; 

 heads numerous, 10-12 mm. high and as broad; involucre campanulate; bracts 

 two-thirds as long as the disk; ligules bright yellow, 8-10 mm. long; achenes 

 glabrous. Wet places in the woods: B.C. Sask. n Wyo. Calif. Submont. 

 My-Jl. 



106. S. Flintii Rydb. Stem about 3 dm. high, striate, sparingly arachnoid- 

 hairy; basal leaves about 8 cm. long; blades orbicular or rounded-oval, abruptly 

 contracted into short petioles, sparingly arachnoid when young, rather thick, 

 entire-margined; stem-leaves lanceolate, sinuately-toothed, auricled and clasp- 

 ing at the base; heads 3-6, about 1 cm. high; bracts linear, 7-8 mm. long; ligules 

 light yellow, broad; achenes striate, glabrous. Mountains: Colo. 



107. S. latus Rydb. Stem 6-8 dm. high, more or less densely crisp-hairy; 

 lower leaves about 1 dm. long, broadly oblanceolate, sinuately toothed, tapering 

 into short winged petioles, white-hairy above, glabrous beneath, except the veins 

 and the margins; upper leaves lanceolate, more or less clasping at the broad base; 

 inflorescence a large compound corymb; involucral bracts short, scarcely more 

 than half as long as the fully developed disk, rather fleshy, oblong; achenes gla- 

 brous. Wet places: Mont. 



108. S. condensatus Greene. Stem copiously arachnoid-floccose when 

 young, 3-4 dm. high; basal leaves 7-15 cm. long, rather thick, with winged peti- 

 oles; blades lanceolate, floccose, irregularly sinuate-dentate, usually crisp; stem- 

 leaves lanceolate, sessile and half-clasping, with auricled bases; heads in a dense 

 cluster; involucres campanulate, 8-9 mm. high; bracts linear; ligules light yellow, 

 8 mm. long; achenes glabrous. S. arachnoideus Rydb. Wet places: Mont. 

 Ida. Wash. Plain Submont. My-Je. 



109. S. columbianus Greene. Stem 3-6 dm. high, floccose when young; 

 leaves sinuate-dentate, the lower petioled, oblanceolate or spatulate, the upper- 

 most hnear-lanceolate, much reduced, sessile; inflorescence a short corymb; invo- 

 lucres campanulate, about 1 cm. high; ligules 5-8 mm. long; achenes glabrous. 

 . iugens A. Gray, in part. S. atriapiculatus Rydb. Valleys: Sask. Colo. 

 Ida. Alaska. Plain Submont. Je-Au. 



110 - S. perplexus A. Nels. Stem erect, 3-6 dm. high, slightly and loosely 



icnnoid-floccose when young; lower leaves oblanceolate or obovate-oblanceo- 



late, obtuse, 5-10 cm. long, with short petioles; upper leaves lanceolate or linear, 



entire or rarely denticulate, slightly if at all clasping, the uppermost reduced; 



