374 Compositaceae 
W. Leaves opposite. HELENEAE (p. 404) 
WW. Leaves alternate. 
X. Involucre gummy but not glandular-hairy, glabrous. 
ASTEREAE (p. 375) 
XX.  Involucre not gummy, or merely with glandular hairs if sticky. 
' Y.  Herbage resinous, glabrous. ASTEREAE (p. 375) 
YY. Herbage not resinous, mostly not glabrous. 
HELENEAE (p. 404) 
TT. Rays not yellow. 
Z. Involucre-bracts scarious or scarious-margined. 
a. Leaves pinnately dissected or compounded. ANTHEMEAE (p. 407) 
aa. Leaves entire. ASTEREAE (p. 375) 
ZZ. Involucre-bracts herbaceous thruout. 
b. Leaves all basal. ASTEREAE (p. 375) 
bb. Leaves not all basal. HELIANTHEAE (p. 395) 
SS. Heads rayless. 
c. Involucre gummy but not glabrous: flowers yellow. ASTEREAE (p. 375) 
cc. Involucre not gummy or merely glandular-hairy if sticky. 
d. Corolla deeply lobed; flowers rarely yellow. CYNAREAE (p. 417) 
dd. Corolla with 4—5 merely triangular teeth. 
e. Receptacle chaffy or hairy. 
f. Plants pubescent with jointed hairs. HELENEAE (p. 404) 
ff. Plants without jointed hairs. HELIANTHEAE (p. 395) 
ee. Receptacle neither chaffy nor hairy. 
g. Heads distinctly white; at least the inflorescence very glandular. 
INULEAE (p. 391) 
gg. Heads yellowish or brownish or purplish; plant usually not 
glandular. 
h. Salt-marsh plants. ANTHEMEAE (p. 407) 
hh. Not salt-marsh plants. 
1. Involucre-bracts scarious at least at margin. 
j. Leaves entire. INULEAE (p. 391) 
jj. Leaves not entire. ANTHEMEAE (p. 407) 
i. Involucre-bracts not scarious tho sometimes bur-like. 
HELENEAE (p. 391) 
BB. — Flowers all ligulate; juice milky in most. CICHOREAE (p. 420) 
AA. — Shrubs. 
k. Leaves glabrous or pubescent but not hoary. 
1. Flowers white or pinkish. EUPATOREAE (p. 374) 
ll. Flowers yellow. ASTEREAE (p. 375) 
kk. Leaves hoary with white or woolly hairs. 
m. Pappus of capillary bristles. 
n. Involucre of 4—6 bracts. SENECEAE (p. 411) 
nn. Involucre of more than 6 bracts. ASTEREAE (p. 375) 
mm. Pappus none. ANTHEMEAE (p. 407) 
EUPATOREAE (BonE-SET ‘TRIBE )—Ours perennial. Leaves in ours entire 
to dentate. Heads rayless, all alike, in ours 10—50-flowered; receptacle in ours naked, 
flat. Flowers perfect, fertile; corolla tubular, regular, 5-toothed, never yellow. Anthers 
without tails at base. Style-branches somewhat club-shaped, obtuse. Pappus-bristles 
capillary, in | series, scabrous to almost plumose. 

