882 CARDUACEAE 



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

 light green and glaucous; rays Ught purple. 59. A. ciliomarginatus. 



XX. Adscendentes. 

 Heads few in a simple corymb. 



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



60. A. armeriaef alius. 

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



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 iisually more or less pubescent on the backs. 



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



Outer bracts wholly gi'een, densely pubescent. 21. A. riolaceus. 



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

 panicle elongate. 62. A. Tueedyi. 



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

 Bracts not spinulose-tipped. 



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



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



Lower leaves narrowly hnear-oblanceolate. 



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



Bracts glabrous, except the cUiate margins. 



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



65. A. NuttaUii. 

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



66. A. halophilus. 

 Bracts with short spinulose or callous tips. 



Stem decidedly puberulent. 67. A. HalHi. 



Stem glabrous. 29. A. denudatus. 



XXI. FULCRATT. 



Outer bracts oblanceolate. 



Leaves broadly lanceolate with auriculate-clasping bases. 



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



Outer bracts appressed or sUghtly spreading; leaves distantly toothed. 

 Outer bracts obtuse. 85. A. Burkei. 



Outer bracts acute. 69. A. phyllodes. 



Leaves linear or Unear-Ianceolate. 70. A. Mearnsii. 



Outer bracts linear, or subulate, or linear-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 auricled. 72. A. fulcratus. 



Leaves linear to oblong-oblanceolate 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-pubervilent or pilosulous above. 



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

 Bracts linear-oblanceolate; stem slioil-jmbescent with stiff hairs above. 

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



76. A. oreganus. 

 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 Unear or Unear-lanceolate. 



Bracts and stem villous. 78. A. Kootenayi. 



Bracts glabrous, except the cUiate margins. 



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



79. A. Forwoodii. 

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

 pubescent, not hispid. 

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

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



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



plant slender. 81. A. diabolicus. 



Lower stem-leaves with winged petioles, the upper sessile, clasping, 

 with usually conspicuous auricles. 82. A. frondeus. 



Outer bracts broadly lanceolate or oblanceolate. 

 Outer bracts mostly acute. 



Leaves firm, liroaiUy lanceolate; auricles of the upper leaves small; branches 



of the inllonspi'iice cri.sp-hirsute. 83. A. Canbyi. 



Leaves tliiii, (jblotig-lanceolate; auricles of the stem-leaves large; branches 

 of the infloi-esc(;u(;e villous. 84. A. Cusickii. 



Outer bracts mostly obtuse. 85. A. Burkei. 



Plant low, 1-2 dm. liigh; heads usually soUtary. 86. A. apricus. 



