No. 17.] 



AGRICULTURAL COLLEGE. 



107 



• 



Bitter-weed. 



Cocklebur. 



Ox-Eye. 



Ambrosia arteruisirefolia, L. 



Ames ; Charles City. 



Ambrosia pilostacliya, DC. 



Ames. 



These species of Ambrosia are vile weeds, and should be eradi- 

 cated as rapidly as possible. 



Xanthium strumarium, L. 



Ames ; Burlington. A bad weed on low grounds. 



Heliopsis lsevis, Pers. 



Ames ; Indianola. 



var. scabra. 



Grinnell. 



Rudbeckia laciniata, L. 



Purple cone-flower. Echinacea angustifolia, DC. 



Ames ; Grinnell ; Burlington. 

 Cone-flower. 



Ames ; Charles City. 



Rudbeckia triloba, L. 



Ames ; Grinnell. 



Rudbeckia liirta, L. 



Ames ; Charles City. 



Lepachys pinnata, Torr. & Gr. 



Indianola ; Grinnell. 



Comm'n Sun-flower. Helianthus annuus, L. 



Actinomeris. 



Tick-seed. 



Beggar-Ticks, 

 Spanish Needles. 



Ames. Has become so thoroughly naturalized as to have much 

 the appearance of a native plant. 



Helianthus rigidus, Desf. 



Ames ; Indianola ; Grinnell. 



Helianthus lsetinorus, Pers. 



Ames ; Charles City. 



Helianthus grosse-serratus, Martens. 



Ames ; Grinnell. 



Helianthus doronicoides, Lam. (?) 



Ames. 

 Actinomeris squarrosa, Nutt. 

 Ames. 



Coreopsis palmata, Nutt. 



Ames ; Charles City. 



Bidens frondosa, L. 



Ames ; Indianola. 



