143 



Arenaria Hookerii, Nutt. Hooker's Sand wort. 



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

 ing hills and buttes. 



Arenaria verna, L. Vernal Sandwort. 



In shady, rocky soil in the Black Hills. 



Arenaria stricta, Michx. Rock Sandwort. 

 In sandy soil in the Black Hills. 



Mcehriiigia lateriflora, (L.) Fenyl. Blunt-leaved Sand- 

 wort. 

 Arenaria lateriflora^ L. 



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

 Black Hills. 



Spergula arveiisis, L. Spurey. 



A naturalized weed, sparingly introduced in the Sioux 

 valley. 



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



On dry soil in the Black Hills, and the surrounding 

 plains. 



NYMPHJSACE^. Water Lily Family. 



]Nymph?ea adveiia, Soland. Large Yellow Pond Lily. 

 Nuphar advena, R. Br. 



In ponds and streams throughout the state, except in 

 the dryer part of the plains region. 



Nymphaea oclerata, (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^. 



Ceratophyllum demersum, L. Hornwort. 



One of the most abundant plants in ponds, lakes and 

 slow streams, from the Missouri river eastward. 



