IOWA ACADEMY OF SCIENCES. 
Plate xv. 
Cnicus altissimus, i , head; 2, leaf; 3, outer bracts; 4, inner bracts: 5, flower; c, corolla; 
b , pappus; d , anthers; e , style; a, achene; 6, style and pollen; 7, anthers; 8 , pollen grain. 
(Charlotte M. King.) 
