PLANTS OF IOWA 231 



Ratibida, Raf. 



3013. B. pinnata, (Vent.) Barnhart. Gray-headed Cone- 



flower. 

 Common on dry prairies. 



3014. R. columnaris, (Sims) D. Don. Long-headed Cone- 



flower. 

 Infrequent. 

 Brauneria, Neck. 



3015. B. angustifolia, (DC.) Heller. Narrow-leaved Purple 



Cone-flower. 

 In dry soil, common. 



3016. B. pallida, (Nutt.) Boynton & Beadle. Pale Purple 



Cone-flower. 

 Dry soil, common. 



3017. B. purpurea, (L.) Britton. Purple Cone-flower. 

 In rich, moist soil. 



Borrichia, Adans. 



3018. B. frutescens, (L.) DC. Sea Ox-eye. 

 Infrequent. 



Helianthus, L. 



3019. E. annus, L. Common Sunflower. 

 Introduced. In waste places, frequent. 



3020. E. petiolaris, Nutt. Prairie Sunflower. 

 Frequent. 



3021. E. scaberrimns, Ell. Stiff Sunflower. 

 On dry prairies and ridges ; common. 



3022. E. occidentalis, Riddell. Few-leaved Sunflower. 

 In dry open places ; common. 



3023. E. gigantcus, L. Giant Sunflower. 

 In open woodlands. 



3024. E. ambiguus, (T. & G.) Britton. Ambiguous Sim- 



flower. 

 In moist soil. 



3025. E. maximiliani, Schrad. Maximillian's Sunflower. 

 Common on prairies. 



