143 



Arenaria Hookerii, Nutt. Hooker's Sandwort. 



In dry, rocky soil in the Black Hills, and the adjoin- 

 ing hills and buttes. 



Arenaria veriia, L. Vernal Sandwort. 



In shady, rocky soil in the Black Hills. 



Arenaria stricta, Michx. Rock Sandwort. 

 In sandy soil in the Black Hills, 



M(]eliriiigia lateriflora, (L.) Fenyl. Blunt-leaved Sand- 

 wort. 

 Arenaria lateriflora^ L. 



In rich, shady soil in the Minnesota valley, and in the 

 Black Hills. 



Spergiila arvensis, L. Spurey. 



A naturalized weed, sparingly introduced in the Sioux 

 valley. 



Paronychia Janiesii, T. & G. James' Whitlow-wort. 



On dry soil in the Black Hills, and the surrounding 

 plains. 



Nymph^ace^. — Water Lily Family. 



Nyniph^ea ad vena, Soland. Large Yellow Pond Lily. 

 Niiphar advena^ R. Br. 



In ponds and streams throughout the state, except in 

 the dryer part of the plains region. 



Nynipli?ea oderata, (Dryand.) Woods & Wood. Pond 

 Lily. 



Quite authentic reports have been received of the oc- 

 currence of this species in a tributary of the Sioux river 

 southeast of Brookings, in the extreme eastern part of 

 the state, but no specimens have been seen. 



Ceratophyllace^. 



Ceratopliylluni deniersuni, L. Hornwort. 



One of the most abundant plants in ponds, lakes and 

 slow streams, from the Missouri river eastward. 



