206 DAVENPORT ACADEMY OF SCIENCES. 



CAPPARIDACEiE 



Cristatella, Nutt. 



74. C. Jamesii, Torr. & Gray. 



Rather frequent along sandy shores of the Cedar near the B., 

 C. R. & X. railroad bridge. This plant has been reported 

 as a narrow leaved form of Polanisia graveolens, Raf. 



Polanisia, Raf. 



75. P. graveolens, Raf. 



Sandy soil along Cedar River ; infrequent. 



76. P. trachyosperma, Torr. & Gray 



Sandv soil, especially along the Mississippi and Wapsipinicon 

 Rivers ; frequent. More widely distributed than the last 

 species. 



CISTACE/E. 



Helianthemum, Tourn. Rock Rose. 



77. H. Canadense, Michx. Frost-weed. 

 Dry, gravelly soil ; frequent. 



Lechea, Kalm. Pinweed. 



78. L. tenuifolia, Michx. 

 Dry soil ; infrequent. 



79. L. stricta, Leggett. 



Prairies on dry, sandy soil ; infrequent. 



VIOLACE^ 



Viola, Tourn. 



80. V.pedata,\,. Bird-foot Violet. 



Borders of woods, hillsides and sand prairies. Not of general 

 occurrence but sometimes abundant locally. 



81. V. pedata, L. var. bicolor, Pursh. 



Border of sandy woods, LakeT'w'p., Muscatine county; with 

 the t\pe>but infrequent or rare. May, 1891. Near Colum- 

 bus Junction, Louisa county, 1890 (Prof. Witter). 



82. V. pedaiifida, G. Don. 



Dry prairies; rather frequent. 



8 •. V. palmata, L. 



Not common in Scott county. In Muscatine county limited 



