106 



AGRICULTURAL COLLEGE. 



[No. 17. 



Daisy Fleabane. 

 Daisy Fleabane. 



Golden Rod. 



Compass Plant. 



Prairie Dock. 



Cud Plant. 



Ragweed. 

 Great Rag-weed. 



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 Riddellii, Frank. 



Ames. 



Solidago ulmifolia, Muhl. 



Ames. 



Solidago nemoralis, Ait. 



Grinnell. 



Solidago Missouriensis, Nutt. (?) 



Ames. 



Solidago Canadensis, L. 



Ames ; Indianola ; Grinnell. 



Solidago lanceolata, L. 



Ames , Grinnell. 



Silphium laciniatum, L. 



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

 is found abundantly on the moister parts of the prairies, 

 but cultivation soon drives it out. 



Silphium terebenthinaceum, L. 

 Burlington. 



Silphium perfoliatum, 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. 



Ames. 



