900 



CARDUACEAE 



Heads small; disk 1 cm. or less wide; ligules white; basal leaves linear-oblanceolate, 



entire. 66. E. asper. 



Heads larger; disk 1-1.5 cm. wide; ligules blue or purple; basal leaves asually more 

 or less toothed, oblanceolate. 67. E. oblanceolatus. 



Pubescence spreading; hairs with pustulate bases; basal leaves narrowly oblanceolate; 

 ligules white or rarely pale rose. 68. E. chnsobrinus. 



Pubescence long, dense, spreading or reflexed. 69. E. Drummondii. 



XIII. Ramosi. 

 XIV. Bellidiastra. 



70. E. ramosus. 



71. E. Bellidiastrum. 



72. E. Wooloni. 



73. E. divergens. 



74. E. flagellaris. 



One species. 

 One species. 



XV. DiVERGENTES. 



Stem simple below; rays usually white. 



Stem branched at the base; rays usually purplish. 



XVI. Flageli-ares. 

 Leaves and stems appressed-hairy. 

 Leaves and stem densely short-pubescent with spreading hairs. 



Basal leaves oblanceolate, entu'e, or 3-lobed at the apex; leaves of the stolons linear; 



plant gray. 7.5. E. commixlus. 



Basal leaves obovate-spatulate, entire, or with several lateral lobes or teeth; leaves 



of the stolons oblanceolate; plant greener. 76. E. nudiflorus. 



XVII. C.\NI. 

 Disk of the heads fully 1 cm. high and about 1.5 cm. wide; basal leaves spatulate, obtuse. 



Leaves canescent. 77. E. Wyomingia. 



Leaves silvery white. 78. E. argentatus. 



Disk of the heads 7-8 mm. high and about 1 cm. wide; basal leaves oblanceolate, mostly 



acutish. 79. E. canus. 



XVIII. Caespitosi. 



Stem leafy; stem-leaves almost as broad as the basal ones. 



Lower leaves narrowly linear-oblanceolate; upper leaves narrowly linear; all acute 



and coarsely hairy; rays usually Ulac or purplish. 80. E. corymbosus. 



Lower leaves oblanceolate or linear-spatulate, iLsually obtusish; stem-leaves linear 

 or oblong; all densely canescent; rays usually wliite. 

 Stem erect, about 3 dm. high, usually with several heads; stem-leaves hnear. 



81. E. subcanescens. 

 Stem decumbent at the base, 1-2 dm. high, with 1-3 (seldom more) heads; stem- 

 leaves oblong. 

 Plant not conspicuously glandular. 82. E. caespitosus. 



Plant conspicuously glandular. 83. E. nauseosus. 



Stem more or less naked above, decumbent at the base; stem-leaves at least the upper 

 ones reduced. 

 Stems about 2 dm. high; disk 10-12 mm. high and about 15 mm. wide. 



84. E. nevadensis. 

 Stems about 1 dm. high; disks about 6 mm. high and less than 1 cm. wide. 



85. E. Eatonii. 



XIX. Asperuginei. 

 Leaves with a spreading rough pubescence. 86. E. asperugineus 

 Leaves strictly appressed-cinereous. 



Disk 10-15 mm. wide; leaves finely and densely hairy; involucral bracts strigose. 



87. E. Twcedyi. 

 Disk 5-10 mm. wide; leaves sparingly and coarsely hairy; involucral bracts hirsute 

 and glandular-puberulent. 88. E. tener. 



XX. Arenarioides. ^^ ^ 

 One species. *»9- E. arenarioides. 



XXI T .— "HiiENTES. 



''^TgiiL" bfc^-f 'r' •'^^^'••?ely more than 1 mm. wide. 90. 



T UrT7> "-y^e. 1.5-2 mm. wide. 91 



• D K~^ ^^' ^^^' scapiform, leafless or few-leaved. 



Pubescence of the stem appressed or ascending; stems decumbent at the base 

 Leaves grayish stngose, in age glabrate; bracts iiirsute. 



Bracts linear, acuminate; ligules mostly purple, 7-8 mm. long. 



92 E Scribneri 

 Bracts lance-hnear. acute; ligules mostly white. 30.' e'. radicatus 



Pnh«!?I?l^'V^t^''^'v*^ ^"^^""^ Strigose. 101. E. pulvinatus. 



Pubescence of the stem spreadmg; stems erect; leaves densely hirsute; hgules wliite 



93. E. Parryi. 

 XXII. Tetr.u'LEUEI. 

 Ligules fully 1 cm. long, wliite; involucres about 1 cm. broad. 94. E. uiahensis 

 Ligules 5-6 mm. long, sky-blue or pinkish; involucres 6-8 mm. broad. 



95. E. sparsifolius. 



XXIII. FILIFOLII. 



Involucres hirsute. oa r fiiifou,,., 



Involucres strigose. If, %\ iZaHs 



I 



E. laelevirens. 

 E. montanensis. 



