Amaranthus
amaranth, pigweed
8 species
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Amaranthus albus – white pigweed, tumbleweed
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east across much of North America to the Atlantic Coast.
Habitat: Dry, disturbed areas.
Origin: Introduced from tropical America
Flowers: June-September
Growth Duration: Annual
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east across much of North America to the Atlantic Coast.
Habitat: Dry, disturbed areas.
Origin: Introduced from tropical America
Flowers: June-September
Growth Duration: Annual
Amaranthus blitoides – matweed, prostrate pigweed
Distribution: Occurring chiefly east of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast; cosmopolitan.
Habitat: Dry, disturbed areas
Origin: Introduced from central United States
Flowers: June - September
Growth Duration: Annual
Distribution: Occurring chiefly east of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast; cosmopolitan.
Habitat: Dry, disturbed areas
Origin: Introduced from central United States
Flowers: June - September
Growth Duration: Annual
Amaranthus blitum – livid amaranth, pale amaranth
Distribution: Occurring chiefly west of the Cascades crest in Washington; southern British Columbia to California; also in the southeastern U.S. and eastern North America.
Habitat: Fields, roadsides, wastelots and other disturbed areas.
Origin: Introduced from the tropics
Flowers: May-July
Growth Duration: Annual
Distribution: Occurring chiefly west of the Cascades crest in Washington; southern British Columbia to California; also in the southeastern U.S. and eastern North America.
Habitat: Fields, roadsides, wastelots and other disturbed areas.
Origin: Introduced from the tropics
Flowers: May-July
Growth Duration: Annual
Amaranthus californicus – California amaranth
Distribution: Occurring east of the Cascades crest in Washington; eastern Washington to California, east to the Rocky Mountains and Great Plains.
Habitat: Moist, often alkaline flats, lakeshores, and vernal pools.
Origin: Native
Flowers: July-October
Growth Duration: Annual
Distribution: Occurring east of the Cascades crest in Washington; eastern Washington to California, east to the Rocky Mountains and Great Plains.
Habitat: Moist, often alkaline flats, lakeshores, and vernal pools.
Origin: Native
Flowers: July-October
Growth Duration: Annual
Amaranthus deflexus – Argentina amaranth
Distribution: Occurring east of the Cascades crest in Washingotn, where known only from Whitman County; Washington to California; also in eastern North America.
Habitat: Open, disturbed areas.
Origin: Introduced from South America
Flowers: July-September
Growth Duration: Annual
Distribution: Occurring east of the Cascades crest in Washingotn, where known only from Whitman County; Washington to California; also in eastern North America.
Habitat: Open, disturbed areas.
Origin: Introduced from South America
Flowers: July-September
Growth Duration: Annual
Amaranthus hybridus – green amaranth, hybrid amaranth, smooth amaranth, green pigweed, smooth pigweed
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Atlantic Coast.
Habitat: Fields, roadsides, wastelots, and other disturbed areas.
Origin: Introduced from eastern North America
Flowers: July-October
Growth Duration: Annual
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Atlantic Coast.
Habitat: Fields, roadsides, wastelots, and other disturbed areas.
Origin: Introduced from eastern North America
Flowers: July-October
Growth Duration: Annual
Amaranthus powellii – green amaranth, Powell's amaranth
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east across North America to the Atlantic Coast.
Habitat: Fields, roadsides, wastelots, and other disturbed areas.
Origin: Introduced from the southwestern United States and Mexico
Flowers: July-October
Growth Duration: Annual
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east across North America to the Atlantic Coast.
Habitat: Fields, roadsides, wastelots, and other disturbed areas.
Origin: Introduced from the southwestern United States and Mexico
Flowers: July-October
Growth Duration: Annual
Amaranthus retroflexus – redroot pigweed, rough pigweed
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
Habitat: Fields, roadsides, wastelots, and other disturbed areas.
Origin: Introduced from eastern and central North America
Flowers: July-October
Growth Duration: Annual
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
Habitat: Fields, roadsides, wastelots, and other disturbed areas.
Origin: Introduced from eastern and central North America
Flowers: July-October
Growth Duration: Annual
