OF DENISON UNIVERSITY. 1 7 



51. D. laciniata Muhl. Toothwort. (Local name Crowfoot.) 

 Woods, more abundant than preceeding and blossoming fully two 

 weeks earlier. April 22, 1887; April 8, 1889; April 10, 1890; April 

 12, 1891. 



31. Cardamine Tourn. 



52. C. rhomboidea D C. Spring Cress. 



Grassy banks of streams and around springs, common. April 

 30, 1884; May 10, 1887; May 11, 1889; May 20, 1890; April 30, 

 1891. 



53. C. rhomboidea D C. var. purpurea Torr. Purple Water 

 Cress. 



Same situations as last, but much more common and blossoming 

 about three weeks eailier. April 20, 1887; April 8, 1889; April 

 6, 1890; April 9, 1891. 



54. C. hirsuta L. Small Bitter Cress. 



Wet places everywhere. This species varies greatly at different 



places and so causes much confusion. May it, 1889; May 15, 1890; 



April 29, 1891. 



■ 

 32. Araeis L. 



55. A. hirsuta Scop. 



Rocky situations, rare, southeast of Newark. June 4, 1890. 



56. A. laevigata Poir. 



Rocky hillsides, common, varies much in size and aspect ac- 

 cording to situation. May 27, 1887; April 30, 1890; May 9, 1891. 



57. A. Canadensis L. Sickle Pod. 



Rocks, rare; ravine near Bald Hill, (Station 16.) June 10, 1890. 



58. A. perfoliata Lam. Tower Mustard. 



Roadsides, genenlly distributed; Alexandria, Newark, etc. 

 June 8, 1888; May 29, 1889; June 14, 1890; May 26, 1891. 



59. A. con fin is Watson. 



Rocky hillsides, rare; Lover's Lane, (Station 18.) June 19, 

 1891. 



60. A. lyrata L. 



Rocks, very rare; Red Rock, Toboso. July 15, 1891. 



61. A. dentata Torr and Gray. 



Creek banks, rather common. April 30, 1890; April 25, 1891, 



