986 CARDUACEAE 



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 cuiieate; plant 3-4 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 pinnatifid, with broad dl\i- 

 sions. - 67. S. pJatylobus. 



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



Basal leaf-blades oblanceolate. 



Plant subglaucous. 70. S. Willingii. 



Plant not subglaucous. 69. S. multnomensis. 



Achenes hispidulous. 71. S. Tweedyi. 



Basal leaves sinuate or entire. 



Stem-leaves pinnatifid with dilated-auriclcd 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. S. crocatus. 

 Stem-leaves not with dilated-auricled bases. 



Stem-leaves entire or nearly so, not auricled. 74. S. Tracyi, 

 Stem-leaves more or less lyrate-pinnatifld. 



Basal leaf-blades suborbicular, sinuate. 75. S. Pammvlii, 



Basal leaf-blades oval or ovate. 



Plant densely cespitose; bracts 5-6 mm, long. 



76. S. aquariensis. 

 Plant not densely cespitose; bracts 7-8 mm. long. 



77. S. Farriae, 

 Heads discoid. 



First basal leaves reniform. 78. S. nephrophyUas, 



None of the leaves reniform. 



Plant stout; stem-leaves ivath broad laciniate segments. 79. S. idahoensis. 



Plant slender; stem-leaves with narrow segments. 



Plant yellowish or light green; bracts not purple-tinged. 



68. S. flavulus. 

 Plant dark green. 



Basal leaves crenate; head 8-10 mm. high; bracts pur pie- tinged, linear. 



80. S. pauciflorus. 



Basal leaves wavy; heads about 6 mm. high; bracts broadly lanceolate or 



oblong, not purple-tinged. 81. S, fedifolius. 



XIII. SUBNUDI. 



One species. 82. 5. subnudus, 



XlV. Anmcouae. 



Blades of the basal leaves orbicular, rounded, subcordate. obovate or cuneate. toothed 



at least at the apex, obtuse. 

 Heads 7-8 mm. high, several in a dense cluster. 83. S. Wardii. 



Heads 9-12 mm. high, soUtary or a few in an open corymb. 



Rays golden yellow. 84. S. petrocallis. 



Rays paler yellow. 



Basal leaf-blades sub-reniform; plant subacaulascent. 85. 5. Porieri. ' 



Basal leaf-blades oval or obovate; plant with a short stem, 

 involucre hemispherical to campauulate. 



Flowering stems about 2 dm. high; heads 9-10 mm. high; basal leaves 

 crenate-serrate, except at the very base; achenes hispidulous on the 

 angles. 86. S. cognatus. 



Flowering stems less than 1.5 dm. high; heads 10-12 mm. high; achenas 



glabrous. 



Stem-leaves linear or linear-oblanceolate, if toothed, only at the 



apex. 87. 5. pentodontus. 



Stem-leaves lanceolate, the lower more or less pinnately lobed or 

 toothed. 88. S. ovinus. 



Involucre turbinate. 89. S. turbinatus. 



Blades of the basal leaves eUiptical to linear, entire or very rarely some of them 3-toothed 



at the apex, acute. 

 Plant in age nearly glabrous, monocephalous, 5-6 cm. high. 90. S. alpicola. 

 Plant more or less permanently floccose, with usually several heads, over 1 dm. high. 



91. S. werneriaef alius. 



