2 20 DAVENPORT ACADEMY OF SCIENCES. 



Callitriche, L. 



246. C. vernd, L. Water Starwort. 



Stagnant slough near Cedar River in the vicinity of Salis- 

 bury Bridge. 



MELASTOMACE^. 

 Rhexia, L 



247. R. Virginica, L. Meadow Beauty. 



In a wet depression on the sand hills of Cedar River, Lake 

 T'w'p., Muscatine county; rare. 



LYTHRACEyE. 



Didiplis, Raf. 



248. D. linearis, Raf. Water Purslane. 

 Bottom of shallow pond near Noels. 



Rotala, L. 



249. R. ramosior, Koehne. 

 Borders of ponds ; frequent. 



Ammania, Houston. 



250. A. coccinca, Rottb. 



Low wet ground ; frequent. 



Ly thrum, L. 



251. L. alatum, Pursh. Loosestrife. 

 Low wet grounds ; common. 



ONAGRACE^E. 

 Ludwigia, L. 



252. L. altcmifolia, L. Seed-box. 

 Borders of ponds ; infrequent. 



253. L. polycarpa, Short & Peter. 

 Ditches; frequent. 



254. L. pa/usiris, E\\. 



In mud and water of shallow ponds, etc.; frequent. 



Epilobium, L. 



255. E. coloratum, Muhl. Willow-herb. 

 Wet grounds ; common. 



CEnothera, L. Lvening Primrose. 



256. CE. biennis, L. 



Fields and waste places ; common. 



