244 



CARDUACEAE 



67. A. Hallii. 

 29. A. denudatus. 



68. A. proximus. 



71. A. Douglasii. 



Bracts with short spinulose or callous tips. 

 Stem decidedly puberulent. 

 Stem glabrous. 



XXI. Fdlcrati. 

 Outer bracts oblanceolate. 



Leaves broadly lanceolate with auriculate-clasping bases. 

 Outer bracts very squarrose or reflexed ; leaves entire. 

 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. 

 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, atu-icled. 



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 pilosuloas 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. 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 linear or linear-lanceolate. 



Bracts and stem villous. 78. A. Kooienayi. 



Bracts glabrous, except the cUiate 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 ii^orescence crisp-hirsute. 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 usually solitary. 86. A. apricus. 



1. O. Haydeni. 

 1. A. Waisoni. 

 1 , D. pubens. 



1. /. stenomeres. 



2. I. alpina. 



39. OREOSTEMMA Greene. 



40. ASTERIGERON Rydb. 



41. DOELLINGERIA Nees. White Aster. 



42. lONACTIS Greene. 

 Plant 2-3 dm. high; leaves linear, 1-2 cm. long. 

 Plant less than 2 dm. high; leaves oblong or lanceolate, 5-10 mm. long. 



43. LEUCELENE Greene. Heath Aster. 



Upper leaves strigose, slightly glandular and not conspicuously hispid-ciliate. 



Lower leaves broadly spatulate, upper Unear-subulate; branches long and slender. 



1. L. arenosa. 

 Leaves all Unear-spatulate, or the upper linear; branches short. 2. L. serotina. 



Upper leaves conspicuously hispid-ciliate, copiously glandular. 



Upper leaves linear-oblanceolate, the lower spatulate. 3. L. hirtella. 



Upper leaves Unear-subulate, the lower linear or linear-oblanceolate. 



Leaves of the branches 6-12 mm. long. 4, L. alsinoides. 



Leaves of the branches 2-5 mm. long. 5. L. ericoides. 



44. MACHAERANTHERA Nees. Tansy Aster, Viscid Aster. 

 Leaves once or twice pinnatifld ; root annual ; achenes terete. 



Green tips of the bracts short, not squarrose. 



Heads 6-7 mm. high; plant .3-5 dm. high. 



1. A/, parviflora. 



