Potamogeton
pondweed
19 species
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Potamogeton alpinus – northern pondweed, reddish pondweed
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains and northern Great Plains; also in eastern North America.
Habitat: Calm water of lakes and slow streams.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains and northern Great Plains; also in eastern North America.
Habitat: Calm water of lakes and slow streams.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Potamogeton amplifolius – broad-leaved pondweed, large-leaved pondweed
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Atlantic Coast.
Habitat: Lakes and ponds, tolerant of deep waters.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Atlantic Coast.
Habitat: Lakes and ponds, tolerant of deep waters.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Potamogeton berchtoldii – Berchtold's pondweed
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Atlantic Coast.
Habitat: Often in acidic waters, lakes, slow streams, sloughs, marshes.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Atlantic Coast.
Habitat: Often in acidic waters, lakes, slow streams, sloughs, marshes.
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: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains; also in northeastern North America; Europe.
Habitat: Shallow to deep water.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains; also in northeastern North America; Europe.
Habitat: Shallow to deep water.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Potamogeton fibrillosus – fibrous-stipuled pondweed
Distribution: Occurring west of the Cascades crest in Washington; Washington to California, east to Idaho, Wyoming, and Utah.
Habitat: Warm, shallow water, lakes, springs, streams.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Distribution: Occurring west of the Cascades crest in Washington; Washington to California, east to Idaho, Wyoming, and Utah.
Habitat: Warm, shallow water, lakes, springs, streams.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Potamogeton foliosus – leafy pondweed
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
Habitat: Standing to moving, shallow water.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
Habitat: Standing to moving, shallow water.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Potamogeton friesii – flat-stalked pondweed
Distribution: Occurring chiefly east of the Cascades crest in Washington; Alaska to Washington, east to Alberta, Idaho, Montana, Wyoming, and Utah, northern Great Plains, Great Lakes region, and eastern North America.
Habitat: Lakes, slow streams, and alkaline water.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Distribution: Occurring chiefly east of the Cascades crest in Washington; Alaska to Washington, east to Alberta, Idaho, Montana, Wyoming, and Utah, northern Great Plains, Great Lakes region, and eastern North America.
Habitat: Lakes, slow streams, and alkaline water.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Potamogeton gramineus – grassy pondweed, variable pondweed
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains, northern Great Plains, Great Lakes region, and eastern North America.
Habitat: Standing or running water.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains, northern Great Plains, Great Lakes region, and eastern North America.
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 to California, east across much of North America 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 to California, east across much of North America 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: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains, Great Plains, Great Lakes Region, and eastern North America.
Habitat: In rather shallow, standing water, often where brackish.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains, Great Plains, Great Lakes Region, and eastern North America.
Habitat: In rather shallow, standing water, often where brackish.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Potamogeton nodosus – loddon's pondweed, long-leaved pondweed
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to Mexico; east over most of the United States to the Atlantic Coast.
Habitat: Shallow to rather deep water.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to Mexico; east over most of the United States to the Atlantic Coast.
Habitat: Shallow to rather deep water.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Potamogeton obtusifolius – blunt-leaved pondweed
Distribution: Occurring west of the Cascades crest in Washington; Alaska to Washington, east across the northern U.S. and Canada to the Atlantic Coast.
Habitat: Lakes, slow streams, and alkaline water.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Distribution: Occurring west of the Cascades crest in Washington; Alaska to Washington, east across the northern U.S. and Canada to the Atlantic Coast.
Habitat: Lakes, slow streams, and alkaline water.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Potamogeton praelongus – white-stalked pondweed, whitestem pondweed
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains, Great Plains, Great Lakes region, and eastern North America.
Habitat: Deep water of lakes.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains, Great Plains, Great Lakes region, and eastern North America.
Habitat: 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: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains, northern Great Plains, Great Lakes region, and northeastern North America.
Habitat: Standing or slow-moving water.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains, northern Great Plains, Great Lakes region, and northeastern North America.
Habitat: Standing or slow-moving water.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Potamogeton robbinsii – fern pondweed, Robbin's pondweed
Distribution: Occurring on both sides of the Cascades crest in Washington; 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: Occurring on both sides of the Cascades crest in Washington; 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 strictifolius – narrowleaf pondweed
Distribution: Occurring east of the Cascades crest in Washington, where known only from Okanogan County; Yukon Territory to Washington, east across the northern U.S. and Canada to eastern North America.
Habitat: Alkaline water, lakes and slow streams.
Origin: Native
Flowers: July-September
Growth Duration: Perennial
Distribution: Occurring east of the Cascades crest in Washington, where known only from Okanogan County; Yukon Territory to Washington, east across the northern U.S. and Canada to eastern North America.
Habitat: Alkaline water, lakes and slow streams.
Origin: Native
Flowers: July-September
Growth Duration: Perennial
Potamogeton zosteriformis – eel-grass pondweed, flat-stem pondweed
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia 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: June-August
Growth Duration: Perennial
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia 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: June-August
Growth Duration: Perennial
