986 CARDUACEAE 



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

 Achenes hispidnloiis. 62. 5. mutabile. 



Basal leaves toothed above the middle. 

 Basal leaves dentate. 



Lower stem-leaves cuneate; 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 distihctly 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. pseudaureux. 

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

 sions. 67. S. plalylobus. 

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

 Basal leaf-blades oblanceolate. 



Plant subglaucous. 70. S. WillingH. 



Plant not subglaucous. 69. S. multnomensis. 



Achenes hispidulous. 71. S. Tweedyi. 



Basal leaves sinuate or entire. 



Stem-leaves pinnatifid with dilated-auricled bases. 



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



72. S. dimorphophyUus. 

 Plant tall, 3-7 dm. liigh; Ugules 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-pinnatifid. 



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



Basal leaf-blades oval or ovate. 



Plant densely cespitose; bracts .5—6 mm. long. 



76. S. aguariensis. 

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



77. S. Farriae. 

 Heads discoid. 



First basal leaves reniform. 78. S. nephrophyllus. 



None of the leaves reniform. 



Plant stout; stem-leaves with broad laciiiiate 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 purple-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. S. subnudus. 



XIV. Andicolae. 



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

 at least at the ape.x, obtuse. 

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



Heads 9-12 mm. liigh, solitary or a few in an open corymb. 



Rays golden yellow. 84. S. petrocallis. 



Rays paler yellow. 



Basal leaf-blades sub-reniform; plant subacaulosccnt. 85. S. Porteri. 

 Ba.sal leaf-blades oval or obovate; plant with a short stem. 

 Involucre hemisphei-ical to campanulate. 



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. cognatiis. 



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



glabrous. 



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



apex. 87. S. prnlodontus. 



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

 toothed. 88. S. oeinus. 



Involucre turbinate. 89. S. turbinatus. 



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

 at the apex, acute. 

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

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



91. 5. werneriaefolius. 



