KEY 



2. coarser plant than preceding; flower-heads bright 

 yellow. Taraxacum. 



LEAVES OPPOSITE. 



1. rays yellow, disks yellow. Helianthus. 



LEAVES ALTERNATE. 



1. flower-heads yellow; leaves entire. Chrysopsis. 



2. rays lilac to violet and white. Aster. 



3. leaves very narrow, entire, scattered; rays white, 



disks yellow. Erigeron (ramosus). 



4. rays yellow, disks brown-purple. Rudbeckia. 



5. leaves finely divided, fragrant; rays white; disks 



yellow. Anthemis. 



6. leaves cut and toothed, narrow; rays white; disks 



yellow. Chrysanthemum. 



7. flower-heads blue. Cichorium. 



8. leaves with spiny teeth; flower-heads yellow. 



Sonchux 



xxi 



