26 BOTANY OF MICHIGAN 



Mackinac Island, in wet swampy ground. Plentiful at that place. Ap- 

 parently infrequent. 



Scirpus pauciflorus Lightf. Few-flowered club-rush. Wet open 

 ground near Alpena along Lake Huron shore. Abundant in spots 

 throughout. 



Scirpus caespitosus L. Tufted club-rush. Wet marshy open places on 

 Bois Blanc Island. Frequent. 



Scirpus hudsonianus (Michx.) Fernald. Alpine cotton-grass. Open 

 boggy places in Presque Isle County. Plentiful. 



Scirpus subterminalis Torr. Water club-rush. Ponds and borders of 

 slow streams. Frequent throughout. 



Scirpus americanus Pers. Three-square. In very 'wet places along 

 the Lake Huron shore, on borders of small lakes and along low banks 

 of streams. Plentiful throughout. 



Scirpus validus Vahl. Great bulrush. In wet marshy places near 

 shore of Lake Huron and about small lakes. Plentiful throughout. 



Scirpus occidentalis (Wats.) Chase. Western bulrush. From Bay 

 County to Mackinac Island. Very abundant in shallow water of Lake 

 Huron above Bay City. Also in marshes, swamps, on the margins of 

 streams, and in and about small lakes. 



Scirpus fluviatilis (Torr.) Gray. River bulrush. In very wet places 

 near Lin wood, Bay County. Plentiful. 



Scirpus atrovirens Muhl. Dark green bulrush. Marshy open ground. 

 Common throughout. 



Scirpus cyperinus pelius Fernald. Wool-grass. In damp marshy 

 open places. Common throughout. 



Eriophorum callitrix Cham. Sheathed cotton-grass. In open bogs. 

 Frequent throughout. 



Eriophorum gracile Roth. Slender cotton-grass. Near lighthouse in 

 Presque Isle County, in a swamp} 7 open place. Frequent throughout. 



Eriophorum viridi-carinatum (Engelm.) Fernald. Tall cotton-grass. 

 Common throughout in open or partially shaded boggy places. 



Eriophorum virginicum L. Virginia cotton-grass. Bogs and damp 

 meadow-like ground. Frequent throughout. 



Rynchospora alba (L.) Vahl. White beaked-rush. Open bogs. Fre- 

 quent throughout. 



Rynchospora capillacea Torr. Capillary beaked-rush. Wet open 

 ground. Plentiful throughout. 



Cladium mariscoides (Muhl.) Torr. Twig rush. Bogs and wet sandy 

 ground. Common throughout. 



Carex scoparia Schkuhr. Pointed broom sedge. Low open ground. 

 Frequent throughout. 



Carex tribidoides Wahlenb. Blunt brown sedge. Damp, usually 

 shaded ground. Frequent throughout. 



