142 SIXTEENTH REPORT. 



Triglochin maritima L. Seaside Arrow-Grass. — Frequent in hogs and 

 very wet marshes. 



Triglochin palustris L. Marsh Arrow Grass. — Very common in damp 

 sand along the Lake Huron shore near Port Franks. Seldom seen elsewhere. 



Alismaceae. Water Plantain Family. 



Sagittaria latifolia Willd. Broad-leaved Arrow-head. — Common in shal- 

 low water and mud. 



Sagittaria arifolia Nutt. Arum-leaved Arrow-head — Frequent in mud 

 and shallow water, especially about Lake St. Clair and near the mouths of 

 St. Clair River. 



Sagittaria heterophylla Pursh. Sessile-fruited Arrow-head. — Occasional 

 about St. Clair Flats in mud and shallow water. 



Sagittaria graminea Michx. Grass-leaved Sagittaria. — Frequent in Sarnia 

 Bay and in mud and shallow water along the mouths of St Clair River. 



Alisma plantago-aquatica L. Water Plantain. Very common in ditches, 

 mud and very wet places. 



Hydrocharitaceae. Frog's Bit Family. 



Elodea canadensis Michx. Water Thyme. Water-weed. — Very common 

 in still and slowly flowing water. Reported as a very troublesome weed in 

 England. 



Vallisneria spiralis L. Tape-grass. Eel-grass. Wild Celery. — Very com- 

 mon in still and slowl}^ moving water. Said to be an excellent food for ducks 

 and carp. Abundant at St. Clair Flats. 



Gramineae. Grass Family. 



Andropogon scoparius Michx. Broom Beard-grass. — Common in dry open 

 ground. 



Andropogon furcatus Muhl. Forked Beard-grass. — Common in dry open 

 or slightly shaded ground. 



Sorghastrum nutans (L) Nash. Indian Grass. Wood Grass. — Frequent 

 in dry ground. Abundant on the lower end of Walpole Island. 



Digitaria humifusa Pers. Small Crab-Grass. — Frequent on dry and sandy 

 ground. L'sually prostrate. 



Digitaria sanguinalis (L.) Scop. Cral) Grass. — Very common and a vicious 

 weed in gardens and cultivated grounds. 



Panicum capillars L. Old-witch Grass. — Very common as a weed in 

 cultivated grounds and waste places. 



Panicum flexile (Gattinger) Seribn. Wiry Panicum. — In open ground wet 

 in spring and fall but dry in summer, especiall}^ on delta islands of St. Clair 

 River. 



Panicum miliaceum L. European Millet. — Occasional in fields and waste 

 places as an escape from cultivation. 



Panicum virgatum L. Switch Grass. — Often in stools or bunches on very 

 poor antl dry ground. Aljundant on the delta islands of St. Clair River where 

 it often covers the ground and resembles a stand of large red-top. 



Panicum depauperatum Muhl. Starved Panicum. — Frequent on dry and 

 poor ()])('n or shaded ground. 



Panicum dichotmum L. Forked Panicum — Common on dry ground and 

 in dry open woods. 



