No. 17.] 



AGRICULTURAL COLLEGE. 



93 



Spring Cress. Cardamine rbomboidea, DC. 



Ames ; Charles City ; Grinnell ; Fayette. 



Rock Cress. Arabis dentata, Torr. & Gray. 



Fayette. 



Wood Cress. Arabis hesperidoides, Gray. 



Ames. 



Worm-seed Mus- Erysimum clieiranthoides, L. 



tard. 



Ames. 



Hedge Mustard. Sisymbrium officinale. Scop. 



Ames ; Fayette. • 



Charlock. Brassica /Sinapistrum, Boissier. (Sinapis arven- 



fcis. L.) 



Ames. 



Black Mustard. Brassica nigra, L. 



Ames ; Charles City ; Fayette. A vile weed, coming into 

 fields from the East. 



Draba Caroliniana, Walt. 



Ames. 



False Flax. Cameliua saliva, Crautz. 



Ames ; Grinnell. 



Shepherd's Purse. Capsella Bursa-pastoris, Moench. 



Ames ; Indianola; Charles City; Fayette ; Barlington. A weed, 

 common in fields and neglected grounds, as are also the 

 two following. 



Wild Pepper-grass. Lepidium Yirginicum, L. 



Ames ; Grinnell ; Fayette ; Burlington. 



Pepper-grass. Lepidium ruderale, L. 



Ames. 



Radish. Rapbanus sativus, L. 



Escaped from cultivation in places. 

 CAPPAKIDACE.E. 



Polanisia graveolens, Raf. 



Ames. 



VIOLACE.E. 



Round-leaved 

 Violet. 



Yiola rotundifolia, Miclix. 



Fayette ; Grinnell. 



