No. 17.] 

 Bitter-weed. 



Cocklebur. 



Ox-Eye. 



Purple Cone-flower. 



Cone-flower. 



Comm'n Sun-flower. 



Actinomeri6. 



Tick-seed. 



Beggar-Ticks, 

 Spanish Needles. 



AGRICULTURAL COLLEGE. JQ7 



Ambrosia arteinisircfolia, L. 



Ames ; Charles City. 



Ambrosia pilostachya, DC. 



Ames. 



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

 cated as rapidly as possible. 



Xanthium strumarium, L. 



Ames ; Burlington. A bad weed on low grounds. 



Ileliopsis laBvis, Pers. 



Ames ; Indianola. 



var. scabra. 



Grinnell. 



Echinacea angustifolia, DC. 



Ames ; Grinnell ; Burlington. 



Rudbeckia laciniata, L. 



Ames ; Charles City. 



Rudbeckia triloba, L. 



Ames ; Grinnell. 



Rudbeckia hirta, L. 



Ames ; Charles City. 



Lepachys pinnata, Torr. & Gr. 



Indianola ; Grinnell. 



Heliantlius annuus, L. 



Ames. Has become so thoroughly naturalized as to have much 

 the appearance of a native plant. 



Heliantlius rigidus, Desf. 



Ames ; Indianola ; Grinnell. 



Heliantlius lsetiflorus, Pers. 



Ames ; Charles City. 



Ilelianthus grosse-serratus, Martens. 



Ames ; Grinnell. 



Heliantlius doronicoides, Lam. (?) 



Ames. 



Actinomeris squarrosa, Nutt. 



Ames. 



Coreopsis palmata, Xutt. 



Ames ; Charles City. 



Bidens frondosa, L. 



Ames ; Indianola. 



