Compositaceae 42] 
LL. Chief involucral bracts in several series; akenes smooth at apex, at- 
tenuate or long-beaked. AGOSERIS (p. 427) 
JJ. Plants with evident stems; stems simple or branched, leafy or bracted; 
flowers | or more on a stem. 
M. Akenes terete or 4—5-angled, not flat. 
N. Pappus of an inner whorl of bristles, and an outer whorl of short 
teeth with O—8 bristles among them, inner whorl deciduous; annual. 
MALACOTHRIX (p. 425) 
NN. Pappus of bristles only and no teeth, persistent; annual or peren- 
nial. 
O. Pappus white; akenes somewhat narrowed at tip; leaves entire to 
Dandelion-like in their lobing. CrEPIs (p. 428) 
OO. Pappus tawny or in a few almost white akenes rarely narrowed 
at tip; leave entire to shallowly toothed but not Dandelion-like. 
HIERACIUM (p. 429) 
MM. Akenes somewhat flat. 
P. Akenes beakless, truncate, heads 50-flowered or more. 
SONCHUS (p. 425) 
PP. Akenes beaked or attenuate, heads 6—30-flowered. 
LactTuca (p. 426) 
AA. Flowers white or pink or blue or purple; stems leafy or bracted. 
Q. Pappus a crown of short blunt scales; heads sessile or nearly so, in spikes or ra- 
cemes.. CICHORIUM (p. 422) 
QQ. Pappus of simple bristles tho often scabrous. 
R. Flowers white; leaves and lower part of stem with long white stiff spreading 
hairs; leaves lanceolate to oblong, entire. HIERACIUM (p. 429) 
RR. Flowers not white; plant without long white stiff spreading hairs; leaves 
usually not as described above. 
S. Leaves entire, lanceolate or narrower, not sagittate at base; flowers rose- 
colored or pink; akene terete, neither flat or angled. 
LyGoDESMIA (p. 426) 
SS. Leaves either not entire or else sagittate at base; flowers pink or blue or 
purplish; akene terete or 4 —5-angled or somewhat flat. 
T. Akene terete or 4—5-angled, not flat; pappus tawny; leaves deltoid-has- 
tate but becoming narrower up the stem; plant 3—6 dm. high. 
NABALUs (p. 429) 
TT. Akene somewhat flat; pappus white; leaves several times as long as 
wide; plant usually taller. LacTuca (p. 426) 
QQQ. Pappus of plumose bristles. 
U. Heads solitary and terminating a leafy stem, 5—10 cm. wide; leaves all en- 
tire: akene with long slender beak; flowers purple. TTRAGOPOGON (p. 425) 
UU. Heads in panicles or corymbs, 2.5 cm. or less wide; mostly with at least 
the basal leaves not entire; flowers pink or white. 
V. Akene tapering into a slender beak as long as the body; involucre 18—25 
mm. high, 15—30-flowered. REFINESQUIA (p. 424) 
VV. Akene truncate, beakless; involucre 6—I5 mm. high, 3—6-flowered. 
PTILORIA (p. 424) 
LAPSANA NIPPLE-WORT 
Annual, erect; stem leafy, branched. Leaves entire to pinnatifid in ours. Heads 
small, in panicles, on slender peduncles; involucre-bracts chiefly in | series, nearly equal, 
a few smaller ones outside; receptacle naked. Flowers yellow. Akenes obovate-oblong, 

