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aa. Branches of the style flat and tipped 
with an appendia. 
aaa. Parts of pappus ©. 
Bigelovia.— Involucre imbricate; scales 
dry. Pappus Il-seriate, capillary, at 
‘maturity brownish. Ray flowers yellow. 
Aplopappus.—-Involucre imbricate, 
scales foliaceous. Pappus 1-seriate, 
bristles rigid. Ray flowers yellow. 
Chrysopsis.—Involucre imbricate. Pap- 
pus 2-seriate, internal capillary, external 
sealy. Ray flowers yellow. 
Lessingia. -Ray flowers enlarged but 
not ligulate. 
Solidago.— Involucre imbricate, scales 
foliaceous. Pappus silky. Ray flowers 
yellow. 
Aster.—Involucre imbricate, scales foli- 
aceous. Ray flowers not yellow, 1-seri-. 
ate. 
Erigeron.— Involucre imbricate, scales 
foliaceous. Ray flowers not yellow, 
oo-seriate. 
bbb. Parts of pappus definite in number. 
Pentachxta.—Scales of involucre not her- 
baceous. Pappus of 5 scabrous bristles 
shorter than the corolla, sometimes de- 
pauperate. Rays yellow. 
