I 21 



Eleocharis interiuedia, (Muhl.) Schuttes. Matted Spike- 

 rush. 



In springy marshes in the Sioux valley, near Brook- 

 ings; rare. 



Sc-irpus pauciflorus, Lightf. Few-flowered Club-rush. 

 In the Black Hills, near Caster. 



Seirpus debilis, Pursh. Weak-stalked Club-rush. 



In the Missouri valley, in Potter and Walworth 

 counties. 



Scirpiis Aiiiericaiius, Pers. Three-squares. 

 Scirpiis pungeus^ Vahl. 



In brackish, or fresh water swamps throughout the 

 state; rare in the Black Hills. 



Hcirpus lacustris, L. Great Bulrush. 



In lakes and ponds throughout the state. 



Sfirims fluviatilis, (Torr.) Gray. River Bulrush. 



On sandy shores of lakes and ponds, and along slow 

 streams from the Missouri valley eastward throughout 

 the state. In one locality "between 600 and 1,000 acres 

 came up in June, 1894, and yielded from 16 to 25 

 bushels per acre of seed, which was used for feed for 

 stock and chickens." 



Scirpus atrovireus, Muhl. Dark-green Bulrush. 



In swamps in the Sioux and Little Minnesota valleys. 



Scirpiis atrovirt'iis pallidus, Britton. Pale Sedge. 

 In the Black Hills. 



Scirpus oyperiims, (ly.) Kunth. Wood-grass. 

 In the Black Hills, near Custer. 



Eriophoruiu polystaoliyou, L. Tall Cotton-grass. 



In springy bogs in the Sioux valley. Watertown, 

 Toronto, Elkton. 

 Erioplioruin ji^raciU', Kock. Slender Cotton-grass. 



Collected in a springy bog in the extreme eastern part 

 of the state, near Elkton. 



