180 BOTANY OF MICHIGAN 



Carez grayii Carey. Gray's sedge. In rich woods near Murphy's 

 Lake. Probably common throughout. 



Carex intumescens Rudge. Bladder sedge. In rich woods near 

 Murphy's Lake. Probably frequent throughout. 



ARACEAE. Arum Family 



Arisaema iriphyllum (L.) Schott. Jack-in-t he-pulpit. Indian turnip. 

 Common throughout in damp rich woods. 



Calla palustris L. Wild calla. Water arum. "Swamps in Dayton 

 and Arbela townships." C. A. Davis. 



Symplocarpus foetidus (L.) Nutt. Skunk cabbage. Abundant in 

 shaded ground along and on the banks of a small creek near Murphy's 

 Lake. " Common in swampy woods, Dayton Township." C. A. Davis. 



Acorus calamus L. Sweet flag. In a wet place on border of Shay's 

 Lake. Probably frequent throughout. 



LEMNACEAE. Duckweed Family 



Spirodela polyrhiza (L.) Schleid. Greater duckweed. Common 

 about ponds and stagnant pools on mud and shallow water. " Common 

 in ditches and ponds." C. A. Davis. 



Lemna minor L. Lesser duckweed. Floating on stagnant water 

 about the small lakes. 



PONTEDERIACEAE. Pickerel-weed Family 



Pontederia cordata L. Pickerel weed. In large ponds and shallow 

 water of the small lakes. Frequent. 



JUNCACEAE. Rush Family 



Juncus bufonius L. Toad rush. "Moist roadsides and wet places 

 along ditches. Often very abundant." C. A. Davis. 



Juncus tenuis Willd. Slender rush. Yard rush. Common on road- 

 sides and along paths. 



Juncus balticus littorolis Engelm. Baltic rush. Occasional in sand 

 on the beach of Saginaw Bay, and in damp places throughout. An ex- 

 cellent sand binder, holding the shore sands firmly in place against the 

 action of wind and wave. 



Juncus effusus L. Common rush. Soft rush. Common in wet and 

 marshy ground. Noticed as often abundant in damp pastures. 



Juncus brachycephalus (Engelm.) Buchenau. Small-headed rush. 

 Marshy places and wet shores. Frequent. 



Juncus brevicaudatus (Engelm.) Fernald. Narrow-panicled rush. 

 Wet muddy, or damp places about ponds, small lakes, low banks of 

 small streams and wet shores. Frequent. 



