IOWA ACADEMY OF SCIENCES. 



Cnicus altissimits, /, head; 2, leaf; j. outer bracts; 4, inner bracts: j, flower; c, corolla; 

 b, pappus; (/, anthers; c, stvle; «, achene; b, style and pollen; 7, anthers; S, pollen grain. 

 (Charlotte M. King. ) 



