. The Canadian field-naturalist. 1998 Notes 711 Homed Pondweed, Zannichellia palustris (Zannichelliaceae), New to the Vascular Plant Flora of the Continental Northwest Territories, Canada, and Deleted from the Flora of the Yukon Territory William J. Cody Biological Resources Program, Eastern Cereal and Oilseed Research Centre, Agriculture and Agri-Food Canada, Central Experimental Farm, Ottawa, Ontario KIA 0C6, Canada Cody, William J. 1998. Homed Pondweed, Zannichellia palustris (Zannichelliaceae), new to the vascular plant flora of the Continental Northwest Territories, Canada, and deleted fr

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. The Canadian field-naturalist. 1998 Notes 711 Homed Pondweed, Zannichellia palustris (Zannichelliaceae), New to the Vascular Plant Flora of the Continental Northwest Territories, Canada, and Deleted from the Flora of the Yukon Territory William J. Cody Biological Resources Program, Eastern Cereal and Oilseed Research Centre, Agriculture and Agri-Food Canada, Central Experimental Farm, Ottawa, Ontario KIA 0C6, Canada Cody, William J. 1998. Homed Pondweed, Zannichellia palustris (Zannichelliaceae), new to the vascular plant flora of the Continental Northwest Territories, Canada, and deleted from the flora of the Yukon Territory. Canadian Field- Naturalist 112(4): 711-712. The first records of Zannichellia palustris from the Continental Northwest Territories are documented from just south of Fort Simpson and just north of Fort Good Hope. Zannichellia palustris is removed from the flora of the Yukon Territory as a record previously reported as this species has been re-identified as an alga Nitellaflexilis. Key Words: Homed Pondweed, Zannichellia palustris, Zannichelliaceae, Northwest Territories, Yukon Territory. Porsild and Cody (1980) suggested that Horned Pondweed, Zannichellia palustris, (Figure 1) which they included in the family Potamogetonaceae, should be looked for in shallow, fresh or mildly saUne ponds or sluggish streams in the southwestern District of Mackenzie on the basis of a collection from Wood Buffalo Park just south of the Alberta border (water of roadside ditch. Salt Plain 20 miles WSW of Fort Smith, near bridge over Salt River (Figure 2 #1), 59°58'N 112°24'W, W.J. Cody 13737, 19 July 1965 (DAG). In September 1972, Glenn H. Crum, while conduct- ing a limnology project adjacent to the proposed Northwest Territories Pipeline in the Mackenzie River valley, collected specimens of Z. palustris from just south of Fort Simpson (Figure 2, #2) and just north of Fort Good Hope (Figure 2, #3). Data are as follows: District of Mackenzie: scattered along the