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Ambrosia. 



Ambrosia artemisieefolia Bitter weed. 



Ambrosia trifida Great rag weed. 



Xanthium. 



Xanthium Canadense Cockle bur. 



Heliopsis. 



Heliopsis scabra Ox-eye. 



KUDBECKIA. 



Rudbeckia laciniata Cone flower. 



Rudbeckia hirta Cone flower. 



Helianthus. 



Helianthus annuus Sunflower. 



Helianthus strumosus Sunflower. 



Helianthus divaricatus Sunflower. 



Helianthus decapetalus Sunflower. 



Helianthus grosse serratus Sunflower. 



Helianthus rigidus Sunflower. 



Coreopsis. 

 Coreopsis trichosperma Tickseeds, sunflower. 



BiDENS. — Bur Marigold. 



Bidens f rondosa Beggar ticks. 



Bidens connata Swamp beggar ticks. 



Bidens cernua Smaller bur marigold. 



Bidens chrysanthemoides Larger bur marigold. 



Bidens beckii Water marigold. 



Helenium. 



Helenium autumnale Sneeze weed. 



Anthemis. — Chamomile. 



Anthemis Cotula May weed. 



Achillea. 



Achillea Millefolium Yarrow. 



Chrysanthemum. 



Chrysanthemum Leucanthemum Ox-eye or white daisy. 



