74 PENNELL : ADDITIONAL DELAWARE CO. PLANTS. 



17 Coreopsis tinctoria Ntitt. 



Native of the prairie States west of the Mississippi 

 River. Occasionally escaped from gardens. 



iS Artemisia absinthium L. 



European. Occasionally escaped from gardens. 



19 Centaurea jacea L. 



European. Occasional weed. Lima. 



20 Centaurea solstitialis L- 



European. Occasional weed. Wawa. 



