882 CARDUACEAE 



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

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



XX. ADSCENDENTES. 



Heads few in a simple corymb. 



Heads less than 1 cm. high; 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. high. 



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 thick, oblanceolate; 



panicle elongate. 62. A. Tweedyi. 



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

 Bracts not spinulose-tipped. 



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



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



Lower leaves narrowly linear-oblanceolate. 



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



Bracts glabrous, except the ciliate margins. 



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



65. A. Nuttallii. 

 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. FULCRATI. 



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 slightly spreading; leaves distantly toothed. 

 Outer bracts obtuse. 85. A. Burkei. 



Outer bracts acute. 69. A. phyllodes. 



Leaves linear or linear-lanceolate. 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 linear, 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-puberulent or pilosulous above. 



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

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

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



76. A. oreqanus. 



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 linear or linear-lanceolate. 



Bracts and stem villous. 78. A. Kootenayi. 



Bracts glabrous, except the ciliate 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. wide; leaves sharply denticulate. 80. A. amplus. 

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



Stem-leaves nearly all sessile, linear-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, broadly lanceolate; auricles of the upper leaves small; branches 



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



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



of the inflorescence villous. 84. A. Cusickii. 



Outer bracts mostly obtuse. 85. A. Burkei. 



Plant low, 1-2 dm. high; heads usually solitary. 86. A. apricus. 



