Potamogeton
pondweed
19 species
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Potamogeton alpinus – northern pondweed, reddish pondweed
Origin: Native
Flowers: June - August
Growth Duration: perennial
Origin: Native
Flowers: June - August
Growth Duration: perennial
Potamogeton amplifolius – broad-leaved pondweed, large-leaved pondweed
Distribution: British Columbia to Newfoundland, south to California in the west and Alabama in the eastern United States, but absent from Nevada to Texas; common west of the Cascades in Washington
Habitat: Generally in fairly deep water
Origin: Native
Flowers: June - August
Growth Duration: perennial
Distribution: British Columbia to Newfoundland, south to California in the west and Alabama in the eastern United States, but absent from Nevada to Texas; common west of the Cascades in Washington
Habitat: Generally in fairly deep water
Origin: Native
Flowers: June - August
Growth Duration: perennial
Potamogeton crispus – curly pondweed
Distribution: Widely dsitributed on both sides of the Cascades crest in Washington; British Columbia to California, east across North America to the Atlantic Coast.
Habitat: Slow-moving rivers and streams, lakes, ponds, and backwater channels, generally at low elevations.
Origin: Introduced from Eurasia
Flowers: June-August
Growth Duration: perennial
Distribution: Widely dsitributed on both sides of the Cascades crest in Washington; British Columbia to California, east across North America to the Atlantic Coast.
Habitat: Slow-moving rivers and streams, lakes, ponds, and backwater channels, generally at low elevations.
Origin: Introduced from Eurasia
Flowers: June-August
Growth Duration: perennial
Potamogeton epihydrus – ribbon-leaved pondweed
Distribution: Alaska south on both sides of the Cascades to California, east to Newfoundland and northeastern United States.
Habitat: Shallow to deep water.
Origin: Native
Flowers: June - July
Growth Duration: perennial
Distribution: Alaska south on both sides of the Cascades to California, east to Newfoundland and northeastern United States.
Habitat: Shallow to deep water.
Origin: Native
Flowers: June - July
Growth Duration: perennial
Potamogeton foliosus – leafy pondweed
Distribution: British Columbia to Newfoundland, south on both sides of the Cascades to Mexico.
Habitat: Standing to moving, shallow water.
Origin: Native
Flowers: Late June - August
Growth Duration: perennial
Distribution: British Columbia to Newfoundland, south on both sides of the Cascades to Mexico.
Habitat: Standing to moving, shallow water.
Origin: Native
Flowers: Late June - August
Growth Duration: perennial
Potamogeton friesii – flat-stalked pondweed
Origin: Native
Flowers: July - August
Growth Duration: perennial
Origin: Native
Flowers: July - August
Growth Duration: perennial
Potamogeton gramineus – grassy pondweed, variable pondweed
Distribution: Alaska to Maine, south to California and New Mexico in the west and West Virginia in eastern United states
Habitat: Standing or running water
Origin: Native
Flowers: June - August
Growth Duration: perennial
Distribution: Alaska to Maine, south to California and New Mexico in the west and West Virginia in eastern United states
Habitat: Standing or running water
Origin: Native
Flowers: June - August
Growth Duration: perennial
Potamogeton illinoensis – illinois pondweed
Distribution: Occurring on both sides of the Cascades crest in Washington; Northwest Territories south to California, east across North America in scattered locations to the Atlantic Coast.
Habitat: Ponds and lakes, usually in rather deep, quiet water.
Origin: Native
Flowers: May-August
Growth Duration: perennial
Distribution: Occurring on both sides of the Cascades crest in Washington; Northwest Territories south to California, east across North America in scattered locations to the Atlantic Coast.
Habitat: Ponds and lakes, usually in rather deep, quiet water.
Origin: Native
Flowers: May-August
Growth Duration: perennial
Potamogeton natans – floating pondweed, floating-leaved pondweed
Distribution: Alaska south on both sides of the Cascades to California, east to Arizona and northeast United States.
Habitat: In rather shallow, standing water, often where brackish.
Origin: Native
Flowers: May - August
Growth Duration: perennial
Distribution: Alaska south on both sides of the Cascades to California, east to Arizona and northeast United States.
Habitat: In rather shallow, standing water, often where brackish.
Origin: Native
Flowers: May - August
Growth Duration: perennial
Potamogeton nodosus – loddon's pondweed, long-leaved pondweed
Distribution: British Columbia south on both sides of the Cascades to Mexico; east over most of the United States.
Habitat: Shallow to rather deep water.
Origin: Native
Flowers: June - August
Growth Duration: perennial
Distribution: British Columbia south on both sides of the Cascades to Mexico; east over most of the United States.
Habitat: Shallow to rather deep water.
Origin: Native
Flowers: June - August
Growth Duration: perennial
Potamogeton praelongus – white-stalked pondweed, whitestem pondweed
Distribution: Alaska south on both sides of the Cascades to California, east through Canada to Newfoundland, south to New York and Indiana.
Habitat: In the Pacific Northwest, mostly in deep water of lakes.
Origin: Native
Flowers: May - July
Growth Duration: perennial
Distribution: Alaska south on both sides of the Cascades to California, east through Canada to Newfoundland, south to New York and Indiana.
Habitat: In the Pacific Northwest, mostly in deep water of lakes.
Origin: Native
Flowers: May - July
Growth Duration: perennial
Potamogeton pusillus – small pondweed
Distribution: British Columbia south on both sides of the Cascades to California, east to the Atlantic.
Habitat: Shallow ponds and streams.
Origin: Native
Flowers: July - August
Growth Duration: perennial
Distribution: British Columbia south on both sides of the Cascades to California, east to the Atlantic.
Habitat: Shallow ponds and streams.
Origin: Native
Flowers: July - August
Growth Duration: perennial
Potamogeton richardsonii – clasping-leaved pondweed, Richardson's pondweed
Distribution: Alaska to Maine, south to California and New Mexico in the west and Illimois in eastern United states; more common west of the Cascades in Washington
Habitat: Standing or slow-moving water
Origin: Native
Flowers: June - August
Growth Duration: perennial
Distribution: Alaska to Maine, south to California and New Mexico in the west and Illimois in eastern United states; more common west of the Cascades in Washington
Habitat: Standing or slow-moving water
Origin: Native
Flowers: June - August
Growth Duration: perennial
Potamogeton robbinsii – fern pondweed, Robbin's pondweed
Distribution: Alaska to California, east to Montana and Colorado; Minnesota to Maine, south to Virginia in eastern United States
Habitat: Quiet water, mostly in lakes
Origin: Native
Flowers: August - September
Growth Duration: perennial
Distribution: Alaska to California, east to Montana and Colorado; Minnesota to Maine, south to Virginia in eastern United States
Habitat: Quiet water, mostly in lakes
Origin: Native
Flowers: August - September
Growth Duration: perennial
Potamogeton zosteriformis – eel-grass pondweed, flat-stem pondweed
Distribution: British Columbia south on both sides of the Cascades to California, east to Idaho and Montana, and much of north central and northeast United States and adjacent Canada.
Habitat: Lakes, ponds and streams.
Origin: Native
Flowers: July - August
Growth Duration: perennial
Distribution: British Columbia south on both sides of the Cascades to California, east to Idaho and Montana, and much of north central and northeast United States and adjacent Canada.
Habitat: Lakes, ponds and streams.
Origin: Native
Flowers: July - August
Growth Duration: perennial
