(2355.) P. cordata, Linn.; Hook., Fl. II., 187.

Frequent in ponds and by lake margins. Marshes near Cape Blomi-don, N.S. (Macoun.) Windsor, Halifax, Pictou, Mahone Bay and Truro, N.S. (Sommers, Oat.) Shallow water, Caledonia, Guysboro Co., N.S. (Faribault.) Kennebeccasis, near the railway station, Fredericton, Grand Lake, several places on the St. John River, Tobi-que Lake, Norton, Clifton Lake, and common in western parts of Charlotte Co., N.B. (Fowler, Cat.) Port St. Francois, Nicolet, Q. (St. Cyr.) Lake St. Augustine, Q. (Thomas.) Very abundant in small lakes near Lake of the Three Mountains, and in sheltered parts of Trembling Lake, Argenteuil Co., Q. (D' Urban.) Mouth of River St. Pierre, near Montreal, 1821. (Br. Holmes.) Nation, Rideau and Ottawa rivers, near Ottawa. (Fletcher, Fl. Ott.) In streams inland, from Prescott northward; very common. (Billings.) Common in all slow-flowing rivers and lakes, and ponds throughout the northern counties of

Ontario. (Macoun.) Burlington Beach, Hamilton, Ont. (Logie.) Moon River, Muskoka Co., Ont., and Parry Sound, Georgian Bay. (Burgess.) St. Joseph Harbor, Georgian Bay. (J. Bell.) From Lake Huron to the Saskatchewan. (Hooker, Fl.)

Tar. angustifolia, Gray, Man. Ed. V., 545. P. angustifoiia, Pursh, Fl. L, 224. This variety is very distinct from the species if the form of the leaf only is considered. The St. Clair specimens have leaves fully eight inches long and not at all cordate at the base. Many of the references given with the species very likely belong here, but we have no means of determining without the specimens. Shallow water, Norton, N.B. (Say.) St. Clair River, Ont. (J. M. Macoun.) Still water, Trent River, above Heely Falls, Northumberland Co.; and Lake Isaac, Bruce Peninsula, Ont. (Macoun.) In water at Parry Sound, Georgian Bay. (Burgess.)