138 THE AMERICAN MIDLAND NATURALIST. 
Scirpus fluviatilis (Torr.) Gray. RIVER BULRUSH. 
Sloughs and ditches. Common. June to. 
Scirpus atrovirens Muhl. 
Lee ins 1891. June 30. 
Heleocharis engelmanni Steud. 
Low, wet places. Occasional. 
Heleocharis palustres:(1,.) R. & S. SPIKE RUSH 
Pond margins and ditches. Common. May 20 (21). 
Heleocharis acicularis (L.) R. & S. 
Pond margins and ditches, especially on mud. left by retreating 
water. Common. 
Heleocharis wolfu Gray. 
Low prairie. Occasional. 
Heleocharis acuminata (Michx.) Nees. 
Low prairie and ditches. Common. May 25 (25). 
Carex rosea Schk 
Woods and thickets. Frequent at least on Minnesota side. 
May 20. 
Carex deweyana Schwein. DEWEY’S SEDGE. 
Woods. Occasional. May 20. ; 
Carex vulpinoidea Michx. FOX SEDGE. 
Low ground. Common. June 20. 
“Carex gravida Bailey. 
Low prairie or near thickets and woods. Common. 
Carex stipata Muhl. 
Roadside ditch near Agr. College; ‘Stevens and C. H. Waldron 
in IgIO. 
Carex marcida Boott. — 
Prairie, especially lower parts. Common. May 20. 
Carex sychnocephala Carey. 
Riverbank. Occasional. 
Carex straminea Willd. 
Three specimens referred here by Bergman. 
Carex festucacea Schk. _ FESCUE SEDGE. 
Prairie and roadsides. Common. May 25 (24). 
Carex bicknellit Britton. 
One specimen referred here by Bergman. 
Carex aquatilis Vahl. 
Riverbank. Frequent. 
