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 usually more 

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



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



ligules white or rarely pale rose. 68. E, consobrinus, 



'.ennft lona. dense, snreadinff or reflexed. 69. E. Drummondii. 



. Ramosi. 

 One species. 70. E. ramosus. 



XIV. Bellidiastra. 

 One species. "l. E. BeUidiastrum, 



XV. DiVEEGENTES. 



Stem simple below; rays usually white. 72. E. Wootoni. 



Stem branched at the base; rays usually purplish. 73. E. dirergens. 



XVI. Flageluyres. 



Leaves and stems appressed-hairy. 74. E. flagellaris. 



Leaves and stem densely short -pubescent with spreading hairs. 



Basal leaves oblanceolate, entire, or 3-lobed at the apex; leaves of the stolons linear; 



plant gray. 75. E. commixtus. 



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

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



XVII. Cani. 



Disk of the heads fully 1 cm. high and about 1.5 cm. wid6; 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-oblaneeolate ; upper leaves narrowly linear; all acute 



and coarsely hairy; rays usually Ulac or purpUsh. 80. E. cory?nbosns. 



Lower leaves oblanceolate or linear-spa tulate. usually obtusish; stem-leaves linear 



or oblong ; all densely canescent ; rays usually white. 

 Stem erect, about 3 dm. liigh, usually with several heads; stem-leaves linear. 



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. Asperugixei. 



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



Leaves strictly appressed-cinereous. 



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



87. E, Tweedyi, 

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

 and glandular-puberulent. 88. E. tener, 



XX. Arexarioides. 



One species. 89. E. arenarioldes. 



XXL L.\etevirextes. 



Stems 1.5-2 dm. high, leafy. 



Ligules blue or purple, scarcely more than 1 mm. wide. 90. B. laetevlrens. 



Ligules white, 1.5-2 mm. wide. 91. E. jnontanensis. 



Stem 3-8 cm. high, scapiform, leafless or few-leaved. 



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

 Leaves grayish strigose, in age glabra te; bracts hirsute. 



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



92. E. Scrlbneri. 



Bracts lance-linear, acute; Ugules mostly white. 30. E. radicatus. 



Leaves and bracts silvery strigose. 101. E. pulvinatus. 



Pubescence of the stem spreading; stems erect; leaves densely hirsute; Ugules white. 



93. E. Parrgi. 



XXIL TETR^VPLEtTRI. 



Ligules fuUy 1 cm. long, white; involucres about 1 cm. broad. 94. E. utahensis, 

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



95. E. sparsifoUus. 



XXIIL FlLIFOUT. 



Involucres hirsute. 96. E. filifolius. 



Involucres strigose. 97. E. linearis. 



