(G3) 



aa. Branches of the stf/le flat and tipped 

 loith an appendix. 



aaa. Parts of pappus co. 



1. Bigelovia. — Involucre imbricate: scales 

 dry. Pappus 1-seriate, capillary, at 

 matiirity brownish. Ray flowers yellow. 



2. Aplopappus. — Involucre imbricate, 

 scales foliaceous. Pappus 1-seriate, 

 bristles rigid. Ray flowers yellow. 



3. Clirysopsis. — Involucre imbricate. Pap- 

 pus 2-seriate, internal capillary, external 

 scaly. Ray flowers yellow. 



4. Lessingia. — Ray flowers enlarged but 

 not ligulate. 



5. Solidago. — Involucre imbricate, scales 

 foliaceous. Pappus silky. Ray flowers 

 yellow. 



6. Aster. — Involucre imbricate, scales foli- 

 aceous. Ray flowers not yellow, 1-seri- 

 ate. 



7. Erigeron. — Involucre imbricate, scales 



foliaceous. Ray flowers not yellow, 

 oo-seriate. 



bbb. Parts of pappus definite in number. 



1 . Pentachgeta. — Scales of involucre not her- 

 baceous. Pappus of 5 scabrous bristles 

 shorter than the corolla, sometimes de- 

 pauperate. Rays yellow. 



