268 CARDUACEAE 



XI. TOMENTOSI. 



Some of the basal leaves entire or dentate. 

 Basal leaves obovate or spatulate. 



Plant con.spicuously rosulate-stoloniferous ; stem-leaves sinuately round-lobed. 



50. S. Fendleri. 

 Plant not stoloniferous ; stem-leaves pinnatifid with toothed lobes or dentate. 

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



Lower stem-leaves obtuse or rovmded 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. salicinux. 



Basal leaves lanceolate, sinuate-dentate. 49. S. canovirens. 



All leaves pinnatifid, with toothed segments. 



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



Heads radiate; leaves scarcely crisp. 



Caude.x subligneous; plant tomentose; bracts shorter than the disk; achenes gla- 

 brous. 50. S. Fendleri. 

 Caudex not subligneous; plant glabrate in age. 



Achenes glabrous. 52. S. uinlahensis. 



Achenes hispidulous. 53. S. multilobatus. 



XII. AUREI. 



Heads radiate. 



Leaves thick, more or less fleshy. 



Basal leaves narrowly oblanceolate. 



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

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

 Cyme dense; upper leaves usually pinnatifid 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. tridenticulatus. 

 Basal leaves crenate. 56. S. oblaneeolatus. 



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



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



57. S. loncjipeliolatus. 

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



58. S. Rydberriii. 

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



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



and with much enlarged bases. 72. S. dimorphophyllus. 



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



Stem-leaves, like 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. 

 Basalleaves obovate, dentate or incised. 61. S. rubricaulis. 

 Achenes liispidulous. 62. S. mutabile. 



Basal leaves toothed above the middle. 

 Basal leaves dentate. 



Lower stem-leaves cuneate; plant 3-4 dm. high. 



63. S. subcunealu!^. 

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



64. S. acutidens. 

 Basal leaves crenate. 05. S. cymbalarioides. 



Leaves thin. 



Basal leaves distinctly crenate or dentate. 

 Achenes glabroiLS. 



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 pinnatifid, 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. mullnomensis. 



Achenes hispidulous. 71. S. Turedyi. 



Bas.^1 leaves sinuate or entire. 



Stem-leaves pinnatifld with dilated-auricled bases. 

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



72. S. dimorphophyllus. 

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



73. 5. crocatus. 



