90 BOTANY OF MICHIGAN 



Car ex hystricina Muhl. Porcupine sedge. Wet boggy open ground. 

 Often abundant. 



Carex retrorsa Schwein. Retrorse sedge. Wet open or partially shaded 

 ground. Plentiful throughout. 



Carex lupulina Muhl. Hop sedge. Swamps and wet woods. Common. 



Carex intwnescens Rudge. Bladder sedge. Wet open or partially 

 shaded ground. Common throughout. 



Carex monile Tuckerm (C. vesicaria monile (Tuckerm.) Fernald). 

 Necklace sedge. Open wet places at Floodwood. Plentiful. 



Carex tuckermani Dewey. Tuckerman's sedge. Rich open ground. 

 Plentiful throughout. 



ARACEAE. Arum Family. 



Arisaema triphyllum (L.) Schott. Indian turnip. Jack-in-the-pulpit. 

 Rich woods, especially hardwoods. Common. 



Calla palustris L. Wild calla. In flitches and very wet boggy places. 

 Often abundant. 



Acorus cala?nus L. Sweet flag. On borders of slow streams. Fre- 

 quent. 



LEMNACEAE. Duckweed Family 



Lemna minor L. Lesser duckweed. Often covering stagnant water 

 in ditches, on and near margins of ponds, small lakes and slow streams. 

 Abundant. Appearing like a green scum on water. 



PONTEDERIACEAE. Pickerel-weed Family 



Pontedcria cordata L. Pickerel-weed. In ponds, small lakes, coves, 

 bays and on margins of slow streams. Noticed in particular along the 

 Tahquamenon River in Luce County. Plentiful. 



JUNCACEAE. Rush Family 



J uncus bufonius L. Toad rush. Damp open ground, often in wet 

 sand and on roadsides. Abundant. 



Juncus tenuis Willd. Slender rush. Damp fields, open places and 

 roadsides. Common. 



Juncus fjreenei Oakes & Tuckerm. Greene's rush. In wet sand near 

 Manistique. Plentiful. Prof. C. A. Davis, 1905. 



Juncus balticus UUoralis Engelm. Baltic rush. Damp open ground 

 and on sandy beaches, where it is an efficient sand binder. Abundant. 



Juncus effusus L. Common rush. Soft rush. Wet open ground. 

 Common. 



Juncus brachycephalus (1 m.) Buchenau. Small-headed rush. 

 Wei shores of Lake Michigan and in open marshy places. Plentiful. 



