10. 
10. 
220. 
Phyllaries narrowly herbaceous, 
with strongly recurving tips; 
rays blue-violet........eeeeeeeee0- A. novi-belgii 
Phyllaries scarious-margined, the 
midribs herbaceous; rays white 
(except in A. praealtus). 
11. Branches of stem widely spreading 
(arched-ascending in A. lateriflorus) ; 
phyllaries appressed-ascending, 
with herbaceous tips conspicuously 
broader than midribs. (Also, 
leaves glabrous, minutely strigose 
above and/or pubescent on lower 
midrib). 
12. Lobes of disc-corollas 
about .5 mm. long, about 
1/3 total length of throat; 
ligules 10 to 30. 
13. Pedicels very leafy, 
3 to 5 times as long 
as heads; whole plant 
extremely leafy; heads 
scattered on branches, not 
in l-sided racemes; seems 
to prefer open field 
habitat........e+++2e+. A. dumosus 
13. Pedicels nearly leafless, 
1/2 to 2 times as long as 
heads; plant moderately 
leafy; heads numerous, 
definitely in l-sided 
racemes; seems to prefer 
moist, partly shaded 
habitat.............-.. A. vimineus 
12. Lobes of disc-corollas 
1 to 1.5 mm. long, about 
2/3 total length of throat; 
ligules 7 to 14............ A. lateriflorus 
