PLANTS OF IOWA 195 



2524. V. lanceolata, L. Lance-leaved Violet. 

 In wet places. 



2525. V. pubescens, Ait. Hairy Yellow Violet. 

 Common in woods. 



2526. V. scabriuscula, (T. & G.) Schwein. Common Yellow 



Violet. 

 Common in rich alluvial woods. 



2527. V. canadensis, L. Canada Violet. 



Common in rich woods, especially on lower banks and 

 slopes. 



2528. V. tricolor, L. Pansy. 



Escaped from cultivation; infrequent. 



CACTACE^. CACTUS FAMILY. 

 Opuntia, Mill. 



2529. 0. kumifusa, Raf. Western Prickly Pear. 

 Infrequent, western part of state. 



THYMELEACE^B. MEZEREON FAMILY. 

 DlRCA, L. 



2530. D. palnstris, L. Leather-wood. 

 Not common. 



EL^EGNACE/E. OLEASTER FAMILY. 



Lepargyr^a, Raf. 



2531. L. argcntea, (Nutt.) Greene. Buffalo-berry. 

 Not common. 



LYTHRACE.E. LOOSESTRIFE FAMILY. 



Ammannia, L. 



2532. A. coccinea, Rottb. Long-leaved Ammannia. 

 Frequent. 



Didiplus, Raf. 



2533. D.diandra, (Nutt.) Wood. Water Purslane. 

 Infrequent. 



Rot ala, L. 



2534. R. ramosior, (L.) Koehne. Rotala. 



In wet soil, common. 



