IOWA ACADEMY OF SCIENCES. 
Plate xviii. 
Cnicus undulatus var. megacephalus . i. head; 2 , outer bracts; j, inner bracts; 4, pappus 
and flower; 5, achenium; 6, stamens, showing sagittate anther sand hairs on filaments; 7, 
style. (Miss Charlotte M. King. ) 
