230 DAVENPORT ACADEMY OF SCIENCES. 



Ambrosia, Tourn. Ragweed. 



384. A. trifida, L. 



Fields and waste places ; common. 



385. A. trifida, L., var. integrifolia, Torr. & Gray. 

 Frequent. 



3S6. A. artemisiaifolia, L. 



Fields and waste places; common. 



387. A . psilostachya , D C. 



Dry sandy soil ; abundant locally. 

 Xanthium, Tourn. Cockleburr. 



388. X. strumarium, L. 



River banks, West Davenport ; frequent. 



389. X. Canadense, Mill. 



Fields and waste places ; common. Abundant along rivers. 



390. A'. Canadense, Mill, var. eckinatum, Gray. 



River bank at West Davenport, Rockingham, and Musca- 

 tine ; infrequent. 

 Eclipta, L. 



391. E. alba, Hassk. 



River banks ; common. 

 Heliopsis, Pers. 



392. H. Item's, Pers. 



Roadsides; infrequent in Scott; frequent in Muscatine. 



393. H. scabra, Dunal. 



Roadsides and waste places ; common. 

 Echinacea, Moench. 



394. E. purpurea, Moench. 



Collected in Louisa county, just outside our limits, in 1891. 



395. E. angustifolia, DC. 

 Dry prairies ; common. 



Rudbeckia, L. Cone-flower. 



396. R. laciniata, L. 



Along streams ; rather common. 



397. R. triloba, L. 



Dry soil ; frequent. 



398. R. subtotnentosa, Pursch. 

 Low prairies; frequent. 



