Zaitsye 
1. Terrestrial or freshwater marsh habitat. 
Sle 
Phyllaries without herbaceous tips, strongly 
scarious. (Also, leaves oblong-lanceolate to 
oblong-oblanceolate, serrate above the middle, 
long-acuminate)......... BreL RodeRcieicnenelsioneroncusioney ere stetsiens 
. Phyllaries with herbaceous tips, their margins 
always partly herbaceous. 
4. At least the basal leaves cordate and petioled. 
Expected (A. cordifolius, A. sagittifolius). 
4. None of the leaves both cordate and petioled. 
5. Bases of cauline leaves auriculate-clasping. 
6. Involucre glandular-hairy. Expected 
(A. patens, A. novae-angliae). 
6. Involucre not glandular. 
7. Leaves either tapering to an abruptly 
widened base or glaucous and leathery. 
Expected (A. prenanthoides, A. laevis). 
7. Leaves tapering to a narrowly auriculate 
base, neither glaucous nor leathery. 
(Also, plant up to 2.5m. tall; stem 
and branches of inflorescence hirsute 
or villous; phyllaries linear-attenuate, 
WHEN NS CarvOUSs MALI MS) leis cueieieieseversioctcle\c 
5. Bases of cauline leaves attenuate or rounded, 
not auriculate-clasping. 
8. Leaves whitened or silvery-silky on both 
sides. Expected (A. concolor). 
8. Leaves green. 
9. Phyllaries very hard and stiff except 
at their herbaceous tips. (Also, 
phyllaries and upper leaves subulate- 
tipped; upper leaves with axillary 
fascicles: Ss tempos) .persicerexteiencis e-cencie 
9. Phyllaries pliable throughout. 
A. acuminatus 
A. puniceus 
A. pilosus 
