126 



Lemnacr.^. — Duckweed Family. 



Spirotlella polyrhiza, (L.) Schleid. Greater Duckweed. 

 In ditches, ponds and lakes throughout the state. 



Leiiiiia trisiiloa, h. Star Duckweed. 



In ponds and pools; so far it has been collected only 

 from the Missouri river eastward. 



Leiniia minor, L. Lesser Duckweed. 



In ponds, lakes and stagnant water throughout the 

 state. 



COMMELINACE^. — Spiderwort Family. 



Tradeseantia virgiiiiaiia, L. Spiderwort. 



Abundant in low moist ground throughout the state. 



PoNTEDERiACE^. — Pickerel weed Family. 



Heteraiithera liiuosa, (Sw.) Willd. Smaller Mud Plan- 

 tain. 



In muddy ponds near Dell Rapids, in the Sioux val- 

 ley and at various points in the Missouri valley. 



Heteraiithera dubia, (Jacq.) McM. Water Star-grass. 

 Schollera graniinea^ Gray. 



In clear water from the Missouri eastward. 



JUNCACE^. — Rush Family. 



Jiincvis efFusus, L. Bog Rush. 



Common in low ground in the Sioux valley. 



Juncvis biifoiiiu.s, L. Toad Rush. 

 In the Black Hills; rare. 



Jiincus tenuis, Willd. Slender Rush. 



Common in the Sioux and the James river valleys and 

 in the Black Hills. 



finncus Vaseyi, Englm. Vasey's Rush. 



Near Hot Springs, in the Black Hills. 



Junevis long'istylis, Torr. Long-styled Rush. 

 Near Lead City, in the Black Hills. 



