244 CARDUACEAE 



Bracts with short spinulose or callous tips. 

 Stem decidedly puberulent. 

 Stem glabrous. 



XXI. FULCR.\TI. 



Outer bracts oblanceolate. 



Leaves broadly lanceolate with aiiriculate-clasping bases. 

 Outer bracts very squarrose or refle.xed ; leaves entire. 

 Outer bracts appressed or sUghtly spreading 

 Outer bracts obtuse. 

 Outer bracts acute. 

 Leaves Linear or linear-lanceolate. 

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



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



Leaves entli-e; bracts close. 



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



Leaves narrowly linear, not aiu-icled. 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. .4. orrganus. 

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

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



XXII. FoLiosi. 

 Plant tall, 4-8 dm. liigh. 



Bracts mainly linear or Unear-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 Arm, broadly lanceolate; auricles of the upper leaves small; branches 



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



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

 of the inflore.scence villous. 84. .4. Cusickii. 



Outer bracts mostly obtuse. 85. A. Burkei. 



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



39. OREOSTEMMA Greene. l. O. Haydeni. 



40. ASTERIGERON Rydb. i. A. Watsoni. 



41. DOELLINGERIA Nees. White Aster. " \. D. pubens. 



42. lONACTIS Greene. 



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



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



2* I. alpina. 



43. LEUCELENE Greene. Heath Aster. 



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



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



1. L. arenosa. 

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



Upper leaves consijicuously hispid-cihate, copiously glandular. 



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



Upper leaves linear-subulate, the lower linear or Unear-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 pinnatifid; root annual; achenes terete. 

 Green tips of the bracts short, not squarrose. 



Heads 6-7 mm. liigh; plant 3-5 dm. high. 1. M- parriflora. 



