Potamogeton gramineus L. × Potamogeton praelongus Wulf.
Annotated by C. B. Hellquist, 2002.

Washington: Island County: South shores of Cranberry Lake; north end of Whidbey Island, southwest end Deception Pass, Puget Sound. Elev. 6 ft.
48° 24' N, 122° 39' W; T34N R1E S35
With Elodea canadensis, P. praelongus, P. amplifolius, P. pusillus, Ceratophyllum demersum. Common aquatic, branched, with floating leaves, submerged leaves clasping, never cucullate at tip. Phenology: Fertile.

P. F. Zika 17601, Aug 22, 2002
With C. B. Hellquist, F. Weinmann
WTU, Accession: 352619

Potamogeton gramineus L. × Potamogeton praelongus Wulf.
Annotated by C. B. Hellquist, 2002.

Washington: Island County: South shores of Cranberry Lake; north end of Whidbey Island, southwest end Deception Pass, Puget Sound. Elev. 6 ft.
48° 24' N, 122° 39' W; T34N R1E S35
With Elodea canadensis, Potamogeton praelongus, Potamogeton amplifolius, Potamogeton pusillus, Ceratophyllum demersum. Common aquatic, branched, with floating leaves, submerged leaves clasping, never cucullate at tip. Phenology: Flowers.

P. F. Zika 17601, Aug 22, 2002
With C. B. Hellquist, F. Weinmann
WTU, Accession: 369372

Potamogeton gramineus × Potamogeton praelongus

Washington: Island County: S shores of Cranberry Lake. N end of Whidbey Island, SW end Deception Pass, Puget Sound. Elev. 2 meters
48° N, 122° E; T34N R1E S35
Coordinate Source: Field measured. Misleading coordinates given only to nearest degree.
Associated taxa: Elodea canadensis, Potamogeton praelongus, P. amplifoilus, P pusillus, Ceratophyllum demersum. Common aquatic, branched, with floating leaves, submerged leaves clasping, never cuculate at tip.

Peter F. Zika 17601, Aug 22, 2002
With C. B. Hellquist & F. Weinmann
WS, Accession: 372826