Ambrosia
bursage, burweed, ragweed
5 species
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Ambrosia acanthicarpaflat spine bur-ragweed, annual bursage, bur ragweed
Distribution: Chiefly east of the Cascades, but widespread in western United States, to Texas and the Dakotas
Habitat: Weedy native in dry areas at low elevations
Origin: Native
Flowers: July - October
Ambrosia artemisiifoliaannual ragweed, common ragweed
Distribution: Occurring on both sides of the Cascades in Washington; widespread throughout North America; also introduced in Europe.
Habitat: Dry, disturbed, open areas at low elevations, including roadsides, pastures, and wastelots.
Origin: Introduced
Flowers: August-October
Ambrosia chamissonissilver beachweed, beach bur, cutleaf beach bur, silver burr-ragweed
Distribution: Maritime shoreline from British Columbia to california
Habitat: Common on sandy beaches above high tide level
Origin: Native
Flowers: June - September
Ambrosia psilostachyaperennial ragweed, western ragweed
Distribution: Occurring in the eastern portion of Washington; widely distributed throughout North America except for Alaska and far northern Canada.
Habitat: Waste ground.
Origin: Native
Flowers: July-October
Ambrosia trifidagiant ragweed
Distribution: Native and widespread in central and eastern United States; an occasional introduction in the Pacific Northwest.
Habitat: Waste places, usually in moist soil.
Origin: Introduced
Flowers: July - October