152 SIXTEENTH REPORT. 



Carex lurida Wahlenb. Sallow Sedge.— Frequent in swamps and wet 

 woods. 



Carex retrorsa Schwein. Retrosse Sedge. — Frequent in wet places. 



Carex retrorsa hartii (Gray) Dewey. Hart Wright's Sedge. — Frequent in 

 wet ground. 



Carex lupuliformis Sartwell. Hop-like Sedge. — Frequent in swamps and 

 wet nicadow-like places. 



Carex lupulina Muhl. Hop Sedge. — Common in swamps and wet woods. 



Carex lupulina pedunculata Dewey. Stalked Hop Sedge. — Range and 

 hai)itat same as above. 



Carex grayii Carey. Gray's Sedge. — Frequent in rich damp woods and 

 damp meadows. 



Carex intumescens Rudge. Bladder Sedge. — Frequent in swamps, rich 

 open woods and damp meadows. 



Carex intumescens fernaldii Bailey. Fernald's Sedge. — Frequent in damp 

 woods. 



Carex rostrata Stokes. Bottle Sedge. — Occasional in very wet and swampy 

 places. 



Carex rostrata utriculata (Boott.) Bailey. Larger Bottle Sedge. — Fre- 

 quent in swamps and shallow water. 



Carex tuckermani Dewey. Tuckerman's Sedge. — Frequent in damp 

 places. 



Araceae. Arum Family. 



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

 Common in rich moist woods and thickets. 



A. dracontium (L.) Schoot, not yet noticed in Lambton Co., but is found 

 along Black river near Port Huron, St. Clair Co., Mich. 



Calla palustris L. Water Arum. Wild Calla. — Occasional on borders of 

 tamarack swamps. 



Symplocarpus foetidus (L.) Nutt. Skunk Cabbage.- — Common in swamps, 

 on wet banks and hillsides. 



Acorus calamus L. Sweet Flag. — Frequent in swamps and on margins of 

 slow streams. 



Lemnaceae. Duckweed Family. 



Spirodela polyrhiza (L.) Schleid. Greater Duckweed. — Common in still 

 water and often on mud. 



Lemna trisulca L. Ivy-leaved Duckweed. — Noticed in stagnant water 

 near the mouths of St. Clair River. 



Lemna minor L. Lesser Duckweed. — Common in ponds, stagnant water, 

 and on mud. 



Commelinaceae. Spiderwort Family. 



Tradescantia reflexa Raf. Reflcxed Spiderwort. — Abundant in dr3'ish 

 ground on the delta islands of St. Clair River. Not noticed elsewhere. 



Tradescantia virginiana L. Virginia Spiderwort. — Occasionally escaping 

 from cultivation and persisthig. 



Pontederiaceae. Pickerel-weed Family. 



Pontederia cordata L. Pickerel- weed. — Frequent in shallow water on 

 borders of ponds, lakes, and slow streams. 



