882 CARDUACEAE 



Bracts with less conspicuous lanceolate green tips; stem-leaves usually entire, 

 light green and glaucous; rays light purple. 59. A. ciliomarginalus. 



XX. Adscendentes. 



Heads few in a simple corymb. 



Heads less than 1 cm. iiigh; upper leaves much reduced; stem 2-3 dm. high, slender. 



60. A. armeriaefolius. 

 Heads over 1 cm. high; leaves all ample; stems stout, 3-6 dm. lugh. 



81. A. diabolicus. 

 Heads many in a leafy panicle. 



Heads about 1 cm. high; stem-leaves lanceolate or oblanceolate. 



Stems 2-3 dm. high; bracts usually more or less pubescent on the backs. 



Bracts with green midvein and tips, puberulent. 61. A. Underwoodii. 



Outer bracts wholly green, densely pubescent. 21. A. violaceus. 



Stems 4-6 dm. high; bracts glabrous on the backs; stem-leaves tliick, oblanceolate; 

 panicle elongate. 62. A. Tueedyi. 



Heads less than 1 cm. high; stem-leaves linear or narrowly Unear-oblanceolate. 

 Bracts not spinulose-tipped. 



Lower leaves oblanceolate; bracts glabrous, except the ciUate margins; plant 



1-3 dm. lilgh. 63. A. adscendens. 



Lower leaves narrowly linear-oblanceolate. 



Bracts more or less hairy on the back. 64. A. Nelsonii. 



Bracts glabrous, except the ciUate margins. 



Leaves of the floral branches elongate, narrowly linear, ascending. 



65. A. NullaUii. 

 Leaves of the floral branches reduced, short, oblong, spreading. 



66. A. halophilus. 

 Bracts with short spinulose or callous tips. 



Stem decidedly puberulent. 67. A. Hallii. 



Stem glabrous. 29. A. denudatus. 



XXI. Ftjlceati. 

 Outer bracts oblanceolate. 



Leaves broadly lanceolate with auriculate-clasping bases. 



Outer bracts very squarrose or reflexed ; leaves entire. 68. A. proiimus. 



Outer bracts appressed or sUghtly spreading; leaves distantly toothed. 

 Outer bracts obtuse. 85. A. Burkei. 



Outer bracts acute. 69. A. phyllodrs. 



Leaves linear or linear-lanceolate. 70. A. Alcarnsii. 



Outer bracts linear, or subulate, or Unear-oblanceolate. 



Leaves, at least the lower ones, toothed; bracts loose. 71. A. Douglasii. 



Leaves entire; bracts close. 



Outer bracts much exceeding the disk; some twice as long. 



Leaves narrowly Unear, not am"icled. 72. A. fulcratus. 



Leaves hnear to oblong-oblauceolate or lanceolate, auricled. 



73. A. cordalenus. 

 Outer bracts seldom exceeding the disk. 



Leaves glabrous above; disk of the head 8-10 mm. high. 



74. A. Eatonii. 

 Leaves minutely scabrous-puberulent or pilosulous above. 



Bracts linear-subulate; stem short-\-lllous above. 75. A. Hendersonii. 

 Bracts linear-oblanceolate; stem short-pubescent with stitf hairs above. 

 Branches and leaves strongly ascending; disk 7-8 mm. high and broad. 



76. A. orrganus. 

 Branches ascending-spreading; leaves spreading; disk 8-10 mm. high 

 and over 1 cm. broad. 77. A. microlonchus. 



XXII. FoLiosi. 

 Plant tall. 4-8 dm. high. 



Bracts mainly hnear or Unear-lanceolate. 



Bracts and stem villous. 78. A. Kootenayi. 



Bracts glabrous, except the ciUate margins. 



Stem-leaves thick, scabrous above; stem rough-hispid, red. 



79. A. Forwoodii. 

 Stem-leaves thinner, lanceolate to linear, acute; stem glabrous, or sparingly 

 pubescent, not hispid. 

 Disk about 2 cm. -vvide; leaves sharply denticulate. 80. A. amplus. 

 Disk 1-1.5 cm. wide; leaves usually entire. 



Stem-leaves nearly all sessile, Unear-lanceolate, only slightly auriculate; 



plant slender. 81. A. diabolicus. 



Lower stem-leaves with \vinged petioles, the upper sessile, claspmg, 

 with usually conspicuous auricles. 82. A. frondeus. 



Outer bracts broadly lanceolate or oblanceolate. 

 Outer bracts mostly acute. 



Leaves firm, broadly lanceolate; auricles of the upper leaves smaU; branches 



of the inflorescence crisp-liirsute. 83. A. Canbyi. 



Leaves thin, oblong-lanceolate; auricles of the stem-leaves large; branches 

 of the inflorescence viUous. 84. A. Cusickii. 



Outer bracts mostly obtuse. 85. A. Burkei. 



Plant low, 1-2 dm. high; heads usuaUy soUtary. 86. A. apneas. 



