O Ib, Bracts not glandular but glabrous or ciliate, less often pubescent 
2 Involucral bracts 1.5-3 mm, long; ray corollas 6 mm, 
© long 4, A. miltiflorus 
y) Involucral bracts 4=8 mm, long or more; ray-corollas 
6 8-15 m, long or more 
4 La. Leaves linear or Jinear-oblanceolate, oblanceolate-oblong 
in one species, 2-10 mm, wide, some rarely 12-15 
a 
mm, wide 
© Ray-corollas 20-25 mm. long; tufted herbs with 
/O several ascending stems Se A. stenomeres 
(, Ray-corollas 8-14 mm, long; erect, leafy, slendere =] 
/O stemmed herbs 
@ Leaves pubescent on the lower surfaces, 
/@, oblanceolate or oblong 6. A. meritus 
Q Leaves glabrous, mostly linear 
/o Leaves more or less serrate 
/2 Leaves 2-3 mm, wide, 1-3 cm, long 7, Ae Hallii 
if Leaves 3-15 mm, wide, 3-15 cm. long 8. A, Douglasii 
/o Leaves entire 
)@ Outer involucral bracts obtuse, somewhat 
/@ mucronate Ge Ae Eatoni 
jp Outer involucral bracts 
ee 
/6 ewl-shaped 10. A. franklinianus 
4 Z2b Leaves oblong or oblong-elliptical or elliptical, the lower 
oblanceolate, commonly 15-30 mm. broad, the broadest 
Cac as narrow as 10 mm. or as broad as 50 mm, 
fo Leaves prevailingly elliptical, acute at both ends, 
boned 
ua at all expanded and clasping at the 
ae 
base ll. A. Engelmannii 
(> Leaves oblanceolate in the lower parts, in the upper 
} oblong or oblong-elliptical, rounded truncate and 
l © © ry 3 
a 
fi? 
Nmore or less clasving at the base 
2 
NO A Fal a Ets emg at alt 
