42 
Scirpus americanus Pers. (S. pungens Vahl.) T 
South Dakota: Brookings, Redfield (Griffiths 80), Aberdeen (Griffiths 115a, b, c), j 
Rosebud (Wallace 71). 
Moist soil and margins of lakes, ponds, and along irrigating ditches. Mr. Griffiths i 
speeimens from Aberdeen show the variation of the species under different con- | 
ditions of soil moisture. No. 115c, which grew in the water of an TN : 
ditch, seems to be variety longispicatus Britt., but the plants are immatur E 
Scirpus atrovirens Muhl. : | 
South Dakota: Mo MUR E Sioux Falls, Iroquois, Rock Ridge Creek (Wallace 69). 
Wet, boggy lan 
Scirpus atrovirens pallidus Britt. "i 
North Dakota: Grand Forks (Brannon 31). 2i 
South Dakota: Bear Creek (Wallace 72). s 
Wet, boggy land. * | 
Scirpus fluviatilis Gray. T | 
orth Dakota: Grand Forks (Brannon 25). FS 
South Dakota: Brookings, Sioux Falls, Aurora 3 (Wilcox), Aberdeen (Grif- : T | 
ths 119), Redfield (Griffiths 72), Huron (Griffiths 
Shallow water. Very common along the borders of 3 throughout the Northwest 
d spreading very rapidly along irrigating ditches and about reservoirs. 
Soirpus lacustris L. 
North Dakota: Grand discum (Brannon 15), Dunseith (Brannon 94), Devil's Lake, 
Fargo, Oakes, 1 
Th Dakota: Big Ston Taks endricks, Brookings, Sioux Falls, Running Water 
lunt, Abarán eme en 110), Aurora County (Wilcox), Rosebud (Wal- 
In eiie so of sloughs and along lake shores. 
Scirpus robustus Pursh. 
North Dakota: Minnewaukon (Brannon 69), Grand Forks. 
South Dakota: Brookings, beum Aberdeen (Griffiths 109), Miller (Griffiths 44), 
Aurora County (Wilco 
In brackish water of aioe lakes and along irrigating ditches. 
Rhynchospora capillacea Torr. 
-North Dakota: Bottineau (Brannon 89). 
In dense mats on boggy ground 
Carex aristata R. Br. : 
North died] Girard Lake (Brannon 1022). 
South Dakota: Brookings, Tacoma Park (Griffiths 99), Plana (Griffiths 84), Aber- 
deen (Griffiths 93). 
Wet, boggy land. 
Carex assinniboiensis W. Boott (7). 
South Dakota: Oakwood Lakes (Griffiths 88). 
Carex festucacea Willd. 
North Dakota: Minot dispu 1162), Oakes. 
South Dakota: Brookin; 
 Bloughs. 
Carex filifolia Nutt. 
um Dakota: Top of Sheep Mountain in the Bad Lands near Cheyenne River 
