204 DAVENPORT ACADEMY OF SCIENCES. 



47. C. hirsuta, L. Small Bitter Cress. 

 Wet places ; frequent. 



Arabis, L. Rock Cress. 



48. A. hirsuta. Scop. 



Rocky places ; Muscatine county ; infrequent. Big Rock and 

 Devil's Glen, Scott county. 



49. A. laevigata, Poir. 



Rocky soil at Wild Cat Den, Big Rock and Le Claire. 



50. A. Canadensis, L. Sickle-pod. 

 Lt Claire ; rare. 



51. A. confinis, Watson. 



Sandy soil, Cedar River region, Noels ; infrequent. 



52. A. dentata, Torr. & Gray. 



Sandy alluvial soil and borders of woods along Cedar River. 

 Muscatine Island. 

 Draba, Dill. Whitlow Grass. 



53. D. Caroliniana, Walt. 



Dry sandy soil ; Noels, Camp McClellan, Muscatine. 

 Nasturtium, R. Br. Water-Cress. 



54. N. sessiliflorutn, Nutt. 



Banks of Mississippi River; frequent. 



55. N. palustre, DC. Marsh Cress. 

 Wet places ; common. 



56. N. lacustre, Gray. Lake Cress. 



Sloughs along Cedar River in the vicinity of Salisbury Bridge, 

 Muscatine county. Ponds near Noels. Leaves fall off early 

 and take root in the mud. 



57. N. Armoracia, Fries. Horseradish. 

 Moist ground ; frequent. 



Barbarea, R. Br. 



58. B. vulgaris, R. Br. Winter Cress. Yellow Rocket. 

 Grain field near Fairport. Railroad track, Blue Grass. 



Hesperis, Tourn. 



59. H. matronalis, L. Rocket. Dame's Violet. 



Escaped to roadsides. Blue Grass, Locust Street, Davenport. 

 Erysimum, Tourn. 



60. R. cheiranthoides, L. Worm-seed Mustard. 

 Banks of streams ; infrequent. 



