36" 



ASTERACEAE 



y. Achenes of disk normal 

 (x) Achenes flat 

 (y) Achenes 4-angled 

 (b) Pappus ], resent 

 x. Rays white 



(x) Pappus of bristles and awns 

 (y) Pappus a short-toothed crown 

 m. Receptacle nearly flat 

 n. Receptacle conic or ovoid 

 y. Rays yellow or orange 



(x) liracts united into a deep cup 

 m. Leaves finely cut ; heads very small 

 n. Leaves coarsely cut; heads large 

 (y) Bracts not united 

 m. Bracts squarrose-spreading 

 n. Bracts not squarrose-spreading 



(m) Leaves typically lobed ; achenes densely hairy 

 (n) Leaves not lobed; achenes smooth or nearly so 

 3. Flowers strap-shaped, all alike 



Achillea 

 Chrysanthemum 



Bolton ia 



Chrysanthemum 

 Matricaria 



Dysodia 

 Tagetes 



Ci rindelia 



G aillardia 

 II elenium 



Ljgulate head of dandelion Taraxacum; showingthe habit of the plant, long sec 

 ligulate or strap-shaped flower, and a parachute fruit. 



tion of the head, a 



