106 



Daisy Fleabane. 

 Daisy Fleabane. 



Golden Rod. 



Compass Plant. 



Prairie Dock. 



Cud Plant. 



Ragweed. 

 Great Rag-weed. 



AGRICULTURAL COLLEGE. 

 Erigeron annuum, Pers. 



Ames ; Grinnell. 



Erigeron strigosum, Muhl. 



Ames ; Charles City. 



Boltonia glastifolia, L'Her. 



Ames. 



Solidago latifolia, L. 



Ames. 



Solidago rigida, L. 



Ames ; Grinnell ; Charles City ; Burlington. 



Solidago Kiddellii, Frank. 



Ames. 



Solidago ulmifolia, Mulil. 



[No. 17. 



Ames. 



Solidago nemoralis, Ait. 



Grinnell. 



Solidago Missourieneis, Nutt. (?) 



Ames. 



Solidago Canadensis, L. 



Ames ; Indianola ; Grinnell. 



Solidago lanceolata, L. 



Ames, Grinnell. 



Silphium laciniatum, L. 



Ames ; Charles City ; Fayette ; Burlington. Tills curious plant 

 is found abundantly on the moister parts of the prairies, 

 but cultivation soon drives it out. 



Silphium terebenthinaceum, L. 



Burlington. 



Silphium perforatum, L. 



Ames; Charles City ; Burlington. At Grinnell it seems to vary 

 from the typical form. 



Parthenium integrifolium, L. 

 Charles City. 



Ambrosia bidentata, Michx. 



Burlington. 



Ambrosia trifida, L. 



Ames ; Charles City. 



var. integrifolia. 



Ame6. 



