(2457.) C. diandrus, Torr. Cyp. 342; Hook., Fl. II., 232.

Low ground around springs, and in marshes by lakes and ponds. Fredericton, N.B. (Fowler, Cat.) Riverside, King's Co., N.B. (Wet-more.) In clefts of rocks on the shore of the St. Lawrence, at Montreal, and at Niagara Falls. (W. F. McCrea.) In all low spots in the vicinity of Ottawa. (Fletcher, Fl. Ott.) Common along the St. Lawrence, at Prescott., Ont. (Billings.) Kemptville, Ont. (Porter.) Low grounds at Kingston, and London, Ont. (Burgess. Millman.) Very common at Belleville, and in the marshes of the Bay of Quinte, Ont. (Macoun.) Marshes at Hamilton. Ont. (Buchan.) Banks of Kettle Creek, St. Thomas, Ont. (Saunders.) Swampy ground, Owen Sound, Ont. (Macoun.) Point Edward, .River St. Clair, Ont. (J. M. Macoun.) Canada. (Goldie.)

Var. castaneus, Torrey, Cyp. 251.

C. flavescens, var. ß. castaneus, Pursh, Fl. L, 52.

Abundant in marshes at Belleville, and at the head of the Bay of Quinte, near the Murray Canal, Ont. (Macoun.) Niagara Falls. (W. F. McCrea.)

(2458.) C - flavescens, Linn.; Gray, Man. Ed. V., 552.

Credited to Canada by Prof. L. N. Britton, in his Revision of this genus. We have never seen a Canadian specimen. It should be looked for along the New Brunswick coast.

(2459.) C - aristatus, Rottb.; Britton. Bull. Torr. Bot. XIII., 207.

C. inflexus, Muhl.; Hook., Fl. II., 232; Macoun, Cat. No. 1909. C. uncinatus, Pursh, Fl. I., 50.

Gravel in the beds of rivers, apparently very local. Vicinity of Ottawa. (Fletcher, Fl. Ott.) West Rideau Lake, Ont. (Porter.) Gravelly bed of the river Moira, at Belleville, Hastings Co; also in the bed of the River Trent, at Trenton, Myersburg, and Heely Falls, Northumberland Co., Ont.; rather uncommon at Somas Falls, four miles from Alberni, west coast of Vancouver Island. (Macoun.) Saskatchewan and Lake Winnipeg. (Hooker, Fl.)

(2460.) C. Schweinitzii, Torr. Cyp., 216.

Sandy shores of lakes and rivers, and on sand hills on the prairies. On sand on the beach along the lake shore at Hamilton, Ont. (Burgess. Millman.) Point Pelée, Lake Erie. (Burgess.) Port Colborne, Lake Erie, and Point Edward, Lake Huron, Ont.; Hungry Hall, Rainy River, and on sand banks where that river enters the Lake of the Woods; on sand hills near the source of the Qu'Appelle, and at Old Wives Lakes, Assiniboia. (Macoun.)

(2461.) C - esculentus, Linn., Britton, Bull. Torr. Bot. XIII, 210.

C. phymatodes, Muhl.; Gray, Man. Ed. V., 554. C. repens, Ell.; Hook., Fl. II., 232. C. tuberosus, Vahl.; Pursh, Fl. I., 52.

On the banks of rivers, chiefly in wet sand. Sandy bank of Kenne-beccasis; Norton, and Fredericton, N.B. (Fowler, Cat.) Gatineau Point, on the Ottawa, Q.; in wet sand at Niagara Town, and near Queenston Heights, along the railway. (Macoun.) In great abundance below Parliament Hill, Ottawa. (Fletcher, Fl Ott.) Low grounds, London, Ont. (Burgess. Millman.) Point Pelée and Point Aux Pins, Lake Erie, Ont. (Burgess.) Upper Canada. (Goldie.)

(2462.) S. Strigosus. Linn.; Hook., Fl. II., 232; Pursh, Fl. L, 52.

C. Michauxianu, Schultes.; Gray, Man. Ed. V., 554.

C. flavicomus, Vahl.; Michx., Fl. I., 27; Pursh, Fl. I., 53.

Not uncommon in Ontario in cold wet pastures and meadows. Nun's Island, Montreal, and Niagara Falls. (IF. F. McCrea.) Wet place, near the outlet of the Rideau Canal, Ottawa. (St. Cyr.) Along the Rideau River at Ottawa. (Fletcher, Fl. Ott.) In a little marsh on the banks of the St. Lawrence, one mile west of Brockville, Ont. (Billings.) West Rideau Lake, Ont. (Porter.) Low wet meadows and boggy places, Kingston, Ont. (Millman.) Kingston, Ont.; Point Pelée, Lake Erie; Point Aux Pins, Lake Erie. (Burgess.) Boggy ground, Gatineau Point, near Ottawa,; wet grassy places along the Bay of Quinte, at Belleville, and in a sandy field at the Murray Canal, near Trenton; near Salt Creek bridge, Brighton, Northumberland Co.; and on an island in Rice Lake; Port Colborne, Lake Erie. (Macoun.) Point Edward, Lake Huron. (J. M. Macoun.) Vicinity of Hamilton, Ont. (Buchan.) Upper Canada to the Saskatchewan. (Hooker, Fl.)

(2463.) C. erythrorhizos, Muhl.; Gray, Man. Ed. V., 552.

Apparently confined to south western Ontario. Point Aux Pins, Lake Erie. (Burgess.)

(2464.) C. filiculmis, Vahl.; Pursh, Fl. I., 52.

C. mariscoides, Ell.; Torr., Fl. I., 63.

C. Kyllingaeoides, Vahl.; Pursh, Fl. I., 50.

Dry sandy woods or fields, not uncommon in central Ontario. Common on Massassagua Point, Bay of Quinte, Ont; sand hills at Murray Townhall, and on Rice Lake Plains, Northumberland Co., Ont.; in sandy fields and thickets at Point Edward, Lake Huron. (Macoun.) Sandy meadows, London, Ont. (Burgess. Millman.) Point Aux Pins, Lake Erie. (Burgess.) Vicinity of Hamilton, Ont. (Buchan.)