268 CARDUACEAE 



Xr. TOMENTOSI. 



Some of the basal leaves entire or dentate. 

 Basal leaves obovate or spatulate. 



Plant conspicuously rosulate-stoloniferous ; stem-leaves sinuately round-lobed. 



50. S. Fendlcri. 

 Plant not stoloniferous ; stem-leaves pinnatifld with toothed lobes or denta^te. 

 Lower stem-leaves acute; plant dark green. 45. S. plattensis. 



Lower stem-leaves obtuse or rounded at the apex; plant yellowish green- 

 Basal leaves dentate; achenes hispidulous on the angles. 



46. S. neomericanus. 

 Basal leaves crenate: achenes glabrous. ~ 47. S. Leonardi. 



Basal leaves lanceolate or oblanceolate; achenes glabrous. 



Basal leaves narrowly oblanceolate, serrate. 48. S. salicinus. 



Basal leaves lanceolate, sinuate-dentate. 49. S. (lanovirens. 



All leaves pinnatifld, with toothed segments. 



Heads discoid; leaves crisp. 51. S. lanatifolius. 



Heads radiate; leaves scarcely crisp. 



Caudex subligueous; plant tomentose; bracts shorter than the disk: achenes gla- 

 brous. 50. S. Fendleri. 

 Caudex not subligneous ; plant glabrate in age. 



Achenes glabrous. 52. S. uintahensis. 



Achenes hispidulous. 53. 5. muUilobatus. 



XII. AUREI. 

 Heads radiate. 



Leaves thick, more or less fleshy. 



Basal leaves narrowly oblanceolate. 



Plant low, less than 2 dm. high, often with several stems from the base; basal 

 leaves short-petioled; achenes hispidulous on the angles; ligules yellow. 

 Cyme dense; upper leaves usually pinnatifld with narrow lobes. 



54. S. densus. 

 Cyme more open; stem-leaves entire or merely crenate. 



Basal leaves subentire or 3-toothed at the apex. 



55. S. trtdenticulalus. 

 Basal leaves crenate. 56. S. oblanceolatus. 



Plant about 4-6 dm. high, simple; achenes glabrous; ligules orange. 



Leaves serrate or subentire; basal leaves 1 cm. or more, slender-petioled. 



57. S. longipetiolaius. 

 Stem-leaves with long, triangular lobes; basal leaves 5 cm. long or less. 



58. S. Rydbergii. 

 Basal leaves cuneate, spatulate, or broadly oblanceolate, subentire at the ba,se. 



Lower stem-leaves spatulate, with broad- winged petioles; upper ones sessile 



and with much enlarged base.s. 72. S. dimorphophyllus. 



Stem-leaves neither broad-winged nor with much enlarged bases. 



Stem-leaves, Uke the basal ones, broadly obovate, coarsely toothed. 



59. S. oodes. 

 Stem-leaves reduced, either very narrow or else pinnatifld. 



Basal leaves angularly dentate or crenate all around, or more or less 

 lyrate. 

 Achenes glabrous. 



Basal leaves oval, crenate, or subentire. 60. S. laetiflorus. 

 Basal leaves obovate, dentate or incised. 61. S. rubricaulis. 

 Achenes hispidulous. 62. S. mutabile. 



Basal leaves toothed above the middle. 

 Basal leaves dentate. 



Lower stem-leaves cuneate ; plant 3— t dm. high. 



63. .S. subcuneatus. 

 Lower stem-leaves oblanceolate; plant about 2 dm. high. 



64. S. acutidens. 

 Basal leaves crenate. 65. S. cymbalarioides. 



Leaves thin. 



Basal leaves distinctly crenate or dentate. 

 Achenes glabrous. 



Basal leaf-blades broad, from cordate to obovate or oval, not tapering at 

 the base. 

 Stem stout; heads 8-10 mm. high. 



Basal leaves usually subcordate at the base; stem-leaves lyrate- 

 pinnatifld, with the lower lobes narrow. 



66. S. pseudaureus. 

 Basal leaf-blades obovate; stem-leaves pinnatifld, with broad divi- 

 sions. 67. S. platylobus. 

 Stem slender; heads 6-7 mm. high. 68.- S. flavulus. 

 Basal leaf-blades oblanceolate. 



Plant subglaucous. 70, S. Willingii. 



Plant not subglaucous. 69. S. muUnomensis. 



Achenes hispidulous. 71. S. Tweedyi. 



Basal leaves sinuate or entire. 



Stem-leaves pinnatifld with dilated-auricled bases. 



Plant low, 1-2 dm., rarely 3 dm. high; ligules mostly yellow. 



72. S. dimorphophyllus. 

 Plant tall, 3-7 dm. high; ligules deep orange to brick-red. 



73. iS. crocalus. 



