SHORE OF LAKE HURON 21 



SPARGANIACEAE. Bur-reed Family 



Sparganium eurycarpum Engelm. Broad-fruited bur-reed. In shallow 



water and damp places from Bay County to St. Ignace and on Mackinac 

 Island. Common. 



Sparganium americanum androcladum (Engelm.) Fernald & Eames. 

 Branching bur-reed. Bay County in swampy ground. G. M. Bradford. 



NAJADACEAE. Pondweed Family 



Potamogeton nutans L. Common floating pondweed. In coves of slow- 

 streams and very wet places near Lake Huron shore. Occasional 

 throughout. 



Potamogeton americanus C. & S. Long-leaved pondweed. In ponds 

 and coves of slow streams. Frequent throughout. 



JUNCAGINACEAE. Arrow Grass Family 



Triglochin maritima L. Seaside arrow grass. Wet marshy ground. 

 Frequent throughout. 



Triglochin palustris L. Marsh arrow grass. In damp open ground on 

 east side of Mackinac Island, and on Bois Blanc Island, Mackinac 

 County. Plentiful. Probably plentiful throughout but overlooked. 



ALISMACEAE. Water-plantain Family 



Sagittaria latifolia Willd. Broad-leaved arrow-head. In shallow 

 water and damp places from Bay County to Mackinaw City. Plentiful 

 throughout. 



Alisma planiago-aquatica L. Water plantain. In shallow water and 

 muddy places. Frequent throughout. 



HYDROCHARITACEAE. Frog's Bit Family 



Elodea canadensis Michx. Water-weed. Ponds, small lakes and in 

 stagnant or slowly moving water. Plentiful throughout. 



Vallisneria spiralis L. Wild celery. In slowly moving water of 

 streams near the Lake Huron shore from Bay Count}' to Mackinaw ( ity. 

 Plentiful throughout. 



GRAMINEAE. Grass Family 



Andropogon scoparius Michx. Broom beard-grass. Dry open ground 

 from Bay County to Bois Blanc Island, Mackinac County. Frequent. 

 Common on jack pine plains in Presque Isle, Montmorency, Oscoda and 

 Ogemaw counties. 



Andropogon furcatus Muhl. Forked beard-grass. Dry open ground 

 from Bay County to St. Ignace, Mackinac County. Frequent, More 



