WOOTON AND STANDLEY FLORA OF NEW MEXICO. 683 



Leaves short, narrowly oblong, obtuse; heads 



numerous 6. A. boltoniae. 



Plants nowhere glandular. 



Outer bracts foliaceous, equaling or surpassing the inner. 



Plants low, 10 to 20 cm. high; leaves broad 8. A. apricus. 



Plants tall, 40 to 60 cm. ; leaves narrow 9. A. canbyi. 



Outer bracts not conspicuously foliaceous, shorter than 

 the inner. 

 Bracts pubescent on the back, usually ciliate. 



Bracts not bristle-pointed ; rays purple 10. A. vallicola. 



Bracts bristle-pointed; rays usually white. 



Pubescence of the stems spreading or re- 

 flexed. 

 Heads small, 5 mm. high or less, very 



numerous 11 . A. hebecladits. 



Heads larger, 7 mm. long or more, few. .12. A. crassulus. 

 Pubescence of the stems appressed. 



Heads small, about 5 mm. high, numer- 

 ous; bracts much imbricated, often 



reflexed 13. ,1. multifloras. 



Heads larger, 7 mm. high or more, few; 



bracts nearly equal, erect, 14. A. commutatus. 



Bracts glabrous, sometimes ciliate. 



Leaves conspicuously ciliate 15. A. blepharophyllus. 



Leaves not ciliate. 



Plants glabrous throughout. 



Rays 2 mm. wide and 8 mm. long, showy; 



cauline leaves clasping 16. .4. laevis. 



Rays 1 mm. wide or less, not more than 

 3 mm. long; cauline leaves not 

 clasping. 

 Stems much branched; leaves thick 

 and fleshy, short; heads long- 

 pedunculate 7. A. neoiin i iciiinis. 



Stems branched only above; leaves 

 thin, long; heads short-pedun- 

 culate 17. .1. (i!l is. 



Stems pubescent, al least with pubescenl 

 lines above. 



Pubescence covering the peduncles is. . I . lonchophyllu8. 



Pubescence in lines on the peduncles. 

 Beads short-pedunculate or nearly 



sessile; leaves thick l!>. .1. salicifolius. 



Beads long-pedunculate; leaves thin. 



Heads large, ID t<> 15 nun. wide. 



tew; stems little branched ; 



Leaves of the inflorescence 



little reduced 20. .1. wootonii 



Heads smaller, usuall l< than 

 in nun. wide, very nu- 

 merous; stems tall much 

 branched ; lea\ « b of the 

 inflore i em •■ much re- 

 reduced 21. .1 . In s/i, riii s. 



