(2455.) N. flexilis, Rostk. & Schmidt.

N. Canadensis, Michx., Fl. II., 220; Pursh, Fl. II, 602; Hook.,Fl. II., 170. Caulina flexilis, Willd.; Pursh, Fl. I., 2.

Locally abundant and widely distributed, extending from the Atlantic to the Pacific. Lake St. John, Q. (Michaux.) Earlstown Lakes, Colchester Co., N.S. (McKay.) Amqui, Metapedia River, Q. (Macoun.) Potter's Lake, St. Stephen, N.B. (Fowler, Cat.) Nation River at Casselman, and other places near Ottawa. (Fletcher, Fl. Ott.) Lake Ontario, at Kingston, Ont. (Millman.) Bay of Quinte, and in still water in all rivers and lakes of central Ontario; also Sydenham River, Owen Sound, Ont. (Macoun.) Point Edward, River St. Clair, Ont.; Lake Mistassini, N.E.T. (J. M. Macoun.) Head of the canal, Sault Ste Marie, Lake Superior; occasionally met with in lakes north of the prairie; English Lake, near Fort Pitt, Saskatchewan River a few very depauperate specimens, Sproat Lake, Alberni, Vancouver Island. (Macoun.)