82 Sierra Club Publications. 



COMPOSIT/E. Sunflower Family. 



KEV TO THE GEI«(ERA. 



HEADS WITH BOTH RAY AND DISK FLOWERS. 

 Leaves opposite. 



Entire plant clothed with cottony wool ; heads medium, with the 

 bracts of the involucre keeled ; pappus of papery scales. 



Eriophyllum, Cotton-batting Plant. 



Heads large, with conspicuous rays ; pappus soft, white, hair-like. 

 Arnica. 



Heads large, with conspicuous rays which become reflexed and 

 papery; persistent; pappus none; flowers glandular. 

 Whitneya. 



Leaves alternate. 



BRACTS OF THE INVOLUCRE IN ONE ROW. 



Rays not yellow. 



Heads of medium size, with narrow rays ; pappus fine, hair-like. 

 (There are some species without rays and some with the bracts 

 of the involucre in more than one row.) 

 Erigeron, Mountain Daisy. 



Rays yellow. 



Heads large, with reflexed rays ; the disk flowers on a globular 



center ; pappus of 4 or 5 papery scales. 



Helenium, Sneeze- weed. 



Heads small or medium, usually numerous; pappus abundant, 



soft and hair-like. . Senecio, Groundsel, Old Man. 



BRACTS OF THE INVOLUCRE IN MORE THAN ONE ROW. 



Heads of medium size, with conspicuous rays ; pappus fine and 

 abundant, hair-like; rays purplish, blue or white; tips of the 

 style long Aster. 



Similar, but with the rays narrower, pappus less abundant, and 

 the style stipes short Erigeron. 



Heads small and numerous, with few and small yellow rays ; 

 pappus soft, white, hair-like. . SolidagO, Goldenrod. 



Heads large, with large, reflexed, yellow raj's ; disk flowers on a 

 large, cone-shaped center ; pappus a chafiy crown cut into four 

 irregular lobes. . . . Rudbeckia, Cone-fiower. 



Heads medium, with short and narrow yellow rays ; pappus of 4 

 papery scales, generally fringed ; involucre glandular and 

 woolly ; Alpine plants. Hulsea. 



Heads large, with conspicuous yellow rays and chaflfy scales mixed 

 with the disk flowers ; pappus chafly. 

 ; Wyethia, Sunflower. 



