No. 17.1 



AGRICULTURAL COLLEGE. 



93 



Spring Cre^s. Cardamine rhomboidea, DC. 



Ames ; Charles City ; Grinnell ; Fayette. 



Rock Cress. Arabis dentata, Torr. & Gray. 



Fayette. 



Wood Ci Arabis liesperidoides, Gray. 



Ames. 



Worm-seed Mus- Erysimum clieiranthoides, L. 



tard - Ames. 



Hedge Mustard. Sisymbrium officinale, Scop. 



Ames ; Fayette. 



Charlock. Brassica Sinapistrum, Boissier. (Sinapis arveu- 



Eis. L.) 

 Ames. 



Black Mustard Brassica nigra, L. 



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

 fields from the East. 



Drab a Carol imana, Walt. 



Ames. 



False Flax Camelina saliva, Crautz. 



Ames ; Grinnell. 



Shepherd's Purse. Q a p sella Bursa-jpastoris, Mcench. 



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

 common in fields and neglected grounds, as are also the 

 two following. 



Wild Pepper grass. Lepidium Virginicum, L. 



Ames ; Grinnell ; Fayette ; Burlington. 



Pepper-grass. Lepidium ruderale, L. 



Ames. 



Radish. 



Raphanus sativus, L. 



cultivation in places. 



CAPPARIDACE.T-:. 



Polanisia graveolens, Raf. 



Ames. 



yrOLACE.H. 



Round-leaved 

 \'iolet. 



Viola rotund ifolia, Michx. 



Fayette ; Griunell. 



