(2399.) S. eurycarpum, Engelm.; Gray, Man. Ed. V., 481.

S. ramosum, Huds.; Hook., Fl. II., 169, in part. Not uncommon but seldom collected. Chiefly along the margins of ponds and lakes. Newfoundland. (Reeks.) Halifax, Pictou, and Oyster Ponds, Guysboro Co., N.S. (Sommers, Cat.) Kentville, and Cape Blomidon, N.S. (Macoun.) Pictou Co., N.S. (McKay.) Common at St. Louis Dam and other places near Ottawa. (Fletcher, Fl. Ott.) Abundant in marshes near Prescott Junction, Ont. (Billings.) Common in the Bay of Quinte and in the still waters of the Trent River, Northumberland Co., Ont. (Macoun.) Marshes, Burlington Bay, Hamilton, Ont. (Logie.) London, Ont., and in the Lake of the Woods. (Burgess.) Kemptville, Ont. (Porter.) Missinaibi River, Ont. (R. Bell.) In water at London, and Newboro, Ont. (Millman.) Ponds, Cypress Hills, Alberta. (Macoun.)

(2400.) S. androcladum, Morong. (MS.)

S. ramosum, Smith,; Pursh, Fl. II., 33; Hook., Fl. II., 169, in part. S. simplex, var. androcladum, Engelm. Gray, Man. Ed. V.,481; Macoun Cat. No. 1722, var. androcladum.

References made to S. eurycarpum, no doubt, in some cases belong here, but except as regards our own specimens we have no means of determining. Indian Cove, Pictou Co., N.S. (McKay.) Norton, N.B. (Fowler, Cat.) Lachine Wood, near Montreal, 1821. (Br. Holmes.) Common in the Nation River at Casselman, near Ottawa; in the Bay of Quinte, and not infrequent on the margins of ponds and lakelets in central Ontario. (Macoun.) At London, Ont.; and in Lake Joseph, Muskoka, Ont. (Burgess.) Not uncommon in marshes near Cedar Hill, and at Nanaimo, Vancouver Island. (Macoun.) Cumberland House, on the Saskatchewan. (Hooker, Fl.)

Var. fluctuans, Morong. (MS.)

S. simplex, var. fluitans, Engelm.; Gray, Man. Ed. V., 481

The branched infloresence includes this form with S. androcladum. Marshes, Campbellton, N.B. (Chalmers.) Severn River, Keewatin. (J. M. Macoun.)

(2401.) S. Simplex, Huds.; Pursh, Fl. I., 34; Hook., Fl. II., 169. S. simplex, Huds., var. Nuttallii, Engelm.; Gray, Man. Ed. V., 481.

Under one form or another this species extends from the Atlantic to the Pacific. Newfoundland. (Miss Brenton.) Labrador. (Butler.) Windsor, N.S. (Sommers, Cat.) Pictou Co., and Magdalen Islands, N.S. (McKay.) Smith's Mills, near Truro, N.S. (Campbell.) Marshy brook at Windsor, N.S,; Black Creek, near Louisburg, Cape Breton. (Macoun.) Caledonia, Guysboro Co., N.S. (Faribault.) Salt Lake, Anti-costi, and in Fox River, Gaspé, Q. (Macoun.) Ouatchechow, Q. (St. Cyr.) In wet places and borders of lakes, Bass River, and Welsford; St.

John Co., N.B. (Fowler, Cat.) Meadows near Gregory's, Montreal, 1821. (Dr. Holmes.) Durham, Q. (McGill Coll. Herb.) Vicinity of Ottawa; common. (Fletcher, Fl. Ott.) Muddy Creek, near Huckleberry Rapids, Argenteuil Co., Q. (D'Urban.) Conway's Creek and other places; common at Prescott, Ont. (Billings.) Mud, in the bed of small streams and along lakes and ponds in central Ontario. (Macoun ) In water, London, and Hatch ley, Ont. (Burgess.) Abundant in the mouths of the Kaministiqua River, and in marshes, Nipi-gon Bay, Lake Superior. (Macoun.) Oba Lake, Ont.; and Nelson River, Keewatin. (B. Bell.) Thunder Creek, at the Elbow of South Saskatchewan, Assiniboia; abundant in marhsy places, along lakes and ponds throughout Vancouver Island, from Victoria to Qualicum, on the east coast; and in the Somas and Stamp rivers at Alberni, on the west side of the island. (Macoun.) Ilgacho Brook, B.C. (Dawson.) Throughout Canada to Fort Franklin; abundant. (Hooker, FL)

(2402.) S. affine, Schnitzlein.

S. natans, Linn.; Pursh, Fl. II., 34; Hook., Fl. II., 169.

S. simplex, Huds., var. angustifolium, Gray, Man. Ed. V., 481. This species is doubtless overlooked in many sections of the country, as it does not seem to be rare; when looked for it can easily be distinguished by its narrow floating leaves. Newfoundland. (Reeks.) North Sydney, Cape Breton, (Macoun.) Halifax, N.S. (Sommers, Cat.) Pictou, Co., N.S. (McCulloch.) Caledonia, Guysboro Co., N.S. (Faribault.) Salmon River; Kennebeccasis and Bass rivers, N.B. (Fowler, Cat.) In marshes, Salt Lake, Anticosti; mouth of the Restigouche River, and Grand Valiée, Gaspe, Q.; muddy border of Partridge Lake, Addington Co., Ont.; abundant in the still waters of the Trent, Seymour, Northumberland Co., Ont., and in the middle channel at the mouth of the Kaministiqua, Lake Superior. (Macoun.) North shore of Lake Superior. (Agassiz.) Lake Joseph, Muskoka Co., Ont. (Burgess.) Lake Mistassini,N.E.T. (J. M. Macoun.) Lake of the Woods. (Dawson.) Kotzebue Sound, and Ounalashka. (Rothr. Alask.) Alpine lakes of the Rocky Mountains; rare, (Hooker, Fl.)

(2403.) S. hyperboreum, Laest., var. Americanum, Beeby.

Apparently a northern species, and evidently not rare in suitable localities. Labrador. (Butler.) In a ditch near Louisburg, Cape Breton Island; in a marsh at Ellis Bay, Anticosti. (Macoun.) Fort George, James Bay. (J. M. Macoun,) Fort Churchill, Hudson Bay. (R. Bell.)

(2404.) S. minimum, Fries.; Gray, Man. Ed. V., 432.

This and S. hyperboreum have hitherto been confounded in our collections, but are now separated. Campbellton, N.B. (Fowler, Cat.) Not rare in swamps near Belleville, Hastings Co., and in the mud of small ponds in Seymour, Northumberland Co., Ont.; Red Deer Lake, at the head of Lake Winnipegoosis, and in marshes along the Porcupine Mountain, Man.; not rare in pools, growing on mud, Columbia Valley at Donald, and westward up Beaver Creek, in the Selkirk Mountains-(Macoun.)