312 COMPOSITAE 
Stem and leaves not glaucescent; leaves thin; achenes pubescent 
8. A. ee atat 
Heads, when numerous, in leafy-bracted Sack or nearly naked cymes or cymose panic 
Heads mostly not small, not racemosely arrange san ft the tb mp eck rays Goaanny blue to purple; 
phyllaries not ie nincronaint e, the pute 3 appressed or spre 
posh leaves obovate to postin usually more eae 2 cm. nig e, “apt conspicuously clasping bases. 
eads crowded toward tips of stem and branches, usually short-pedicelled or subsessile; 
involucre 6- ‘3 mm. high, rarely Teaiy: bracted, the a ee s asap pilosulose. 
Heads solitary or few at tips of stem and branches ei er Ea 
. A. foliaceus. 
pene © — lanceolate or linear, 0.5—2 cm. wide, slightly if at oe clasping. 
Plants of cold bogs; heads aalitiees at pia of widely peter te ents or ne aap 
paludic 
Plants not of cold bogs; heads not oe. at pig of widely divergent branches or branchlets. 
Inflorescence a leafy panicle; heads y (sometimes few in A. subspicatus). 
ches of au and ae cles aan caeals os ag with small 
leaves; involucre usually try Sitghtly: graduate (more so in A. hesperius). 
Leaves mostly linear or linear-lanceolate, entire, gee cas rarely serrate. 
Coarse plants 1-1.5 m. high; pubescence of s s and branchlets in 
Pee urrent lines from the igs hance: “involucre, rarely if at all with 
pest ual subtending bract 10. A. hesperius. 
Plants usually less than : m. high: pubes: cap em uniform, or if in 
lines at least uniform under dhe heads je neatly glabrate. 
eaton 
Leaves Poagenicnt cidanceerate or lanceolate, even the = middle one ones mostly serrate 
xo: tu 
—_ of the: cane’ and en cisaebindenty ibtlaeis with small 
aves; involucre strongly graduate. 
A ooo: open, sometimes widely Greceent. namie: involucre 7-10 mm. 
haa ge of er : : 
1 4 hil NSIS. 
Inflorescence a close panicle or raceme; involucre 4-6 mm. high. 
He rate Mapai ebbing pubescent rah ee hairs; plants of 
uthern mgs 19. A. bernardinus. 
Socbace essentially areas haem y scabrous, on the leaf-margins) ; 
plants of western Washin and Ore 
Inflorescence essentially a naked cyme or cymose He oy head usually few (often 
ameny in A. adscenden ax 
+. 
raduate, in 3, sometimes 4, s 
ries. 
Stem-leaves mostly linear, not reduced i in size on the upper stems; branches of 
the 
16. A. sanamens: 
Upper stem-leaves fe ws 8 reduced in size; the cymose panicle open with 
spreading bra 17. A. occidentalis intermedius. 
Involucre scarcely cha the phyllaries in 2 series. ne 
17. 
Heads — and very numerous, racemosely — arranged on the Reger spreading = a rays white 
(r y purp ple ) 7P 
Plants sit well-developed creeping rhizomes; disk 6-7 mm. high, the rays 22-30. 
. A. falcatus crassulus. 
Plants with stems clustered from a short rhizome or caudex; disk 4-5 ny eect the rays 12-20. 
. A. pans 
II. EucepHALus. 
e pi ly pale beneath with a more or less dense tomentum. 
Rays 0-4; inner phyllaries ovate, obtuse, canescent. . A. brickellioides. 
ay 3 inner phyllarie es lances, gla ndu ook 25. A, ledophyllus. 
Leaves not conspicuously pale glabrous t pub t, or sparsely pilose. 
eads discoid or occasi sana lly ga 2-3 
Inflorescence corymbiform with daa branchlets; peduncles glabrous or somewhat F7 Sane beneath 
the involucre. 23. A. siskiyou 
Tadeene ake, an elongated panicle with short branchlets; peduncles eagerer ar an somewhat hickite. 
. vialis. 
Heads radiate with 6-18 r 
Involucr 
Fok agua ae phylaries closely imbricate and appressed in age; leaves scabrous-puberulent on 
surface 
s and margin 26. A. perelegans. 
—— — hemispheric, or campanulate, the phyllaries more or less loosely imbricate and spreading 
Inflorescence c orymbiform , with several to many heads; plants robust, 6-15 dm. tall. 
es glaucescent, soit eight or more times as long as wi me, the margins obscurely serrulate. 
pee A, REMCeTC Ene: 
Leaves not glaucescent, three to six times as long as wide, tl 
28. A. pip Ay 
Heads a rarely 3 or 4; plants 1.5-3.5(5) dm. tall. 
from a woody caudex; phyllaries lanceolate-acuminate ;  acgr of the ane Mountains. 
paucicapitatus 
Plants from a creeping woody -eipiaae phyllaries oblong-ovate to ovate; jeri of the vicinity 
of Mount Jefferson, Oregon 30. A. gormanii. 
II. TANTHE. 
Leaves linear, usually 2-3 cm. long, not definitely callous-margined; plant green. 
; 31. A. stenomer 
Leaves chiefly elliptic or linear-oblong, usually under 1.5 em. long, with whitish earns margin; oiant subcinereous. 
. A, scopulorum. 
