TUSCOLA COUNTY 171 



Potamogeton heterophyllus Schreb. Various-leaved pondweed. "( 

 River and millponds at Vassar and Caro." C. A. Davi-. 



Potamogeton peetinalus I j. Fennel-leaved pondweed. "Millponds of 

 Caro." C.A.Davis. 



Najas flexilis (Wild.) Rostk. & Schmidt. Slender najas. "Ditches 

 in Akron and Wisner townships near the bay. ,: C. A. Davis. 



JUNCAGINACEAE. Arrow Grass Family 



Triglochin maritinia L. Seaside arrow-grass. In marshy places (-or- 

 dering the Saginaw Bay shore and near the small lakes. 



Triglochin palustris L. Marsh arrow-grass. Occasional in wet sand 

 along the Saginaw Bay beach. "Common on the prairies in Akron and 

 Wisner townships. " C. A. Davis. 



ALISMACEAE. Water Plantain Family 



Sagittana laii folia Willd. Broad-leaved arrow-head. Common in 

 wet places along the Saginaw Bay shore, ditches, slow streams and about 

 the 'small lakes. 



Sagittaria heterophylla Pursh. Sessile-fruited arrow-head. "In ( 

 River about Vassar." C. A. Davis. 



Alisma plantago-aquatica L. Water plantain. Common in ditches, 

 slow streams, wet and muddy places, and about the small lab 



HYDROCHARITACEAE. Frog's Bit Family 



Elodea canadensis Michx. Water-weed. Noticed in the small lakes 

 and in the creek at Quanicassee. 



Vallisneria spiralis L. Wild celery. Tape grass. "Millponds at 

 Caro and Vassar. Ditches near Saginaw Bay.' C. A. Davis. Said to 

 be an attractive food for wild ducks. 



GRAMINEAE. Grass Family 



Andropogon scoparius Michx. Broom beard-grass. Occasional on 



poor ground near the Saginaw Bay shore. 



Andropogon furcatus Muhl. Forked beard-grass. Frequenl in dry 

 open places. 



Sorghastrum nutans (L.) Nash. Indian grass. Wood grass. No- 

 ticed by Prof. C. A. Davis on low sand ridges in northern part of Akron 

 Township. 



Digitaria sanguinalis (L.) Scop. Crab grass. A common and vicious 

 weed in gardens and fields. 



Panicum capillar -e L. Old-witch grass. Common a- a weed in gar- 

 dens and fields. 



