OF DENISON UNIVERSITY. 1 7 



51. D. laciniata Muhl. Toothwort. ^ocal 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, 1 89 1. 



54. C. hirsuta L. Small Bitter Cress. 



Wet places everywhere. This species varies greatly at different 

 places and so causes much confusion. May 11, 1889; May 15, 1890; 

 April 29, 1891. 



32. Arabis 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, generally distributed; Alexandria, Newark, etc. 

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



59. A. confinis 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. 



