[Members of the Sunflower Family with Discoid Flower Heads Found West of the Cascade Mountains]

Ragweeds West of the Cascade Mountains of Oregon and Washington

The Genus Ambrosia

Cutleaf Beach Bur, Cutleaf Beach Bur: Ambrosia chamissonis var. bipinatisecta (Synonym: Franseria chamissonis var. bipinnatisecta)

Cutleaf Beach Bur, Cutleaf Beach Bur: Ambrosia chamissonis var. bipinatisecta

Annual Ragweed, Common Ragweed: Ambrosia artemisiifolia -

Beach-bur, Cutleaf Beach Bur, Cutleaf Beach Bur, Silver Beachweed, Silver Bur Ragweed: Ambrosia chamissonis var. bipinnatisecta (Synonyms: Franseria chamissonis ssp. bipinnatisecta, Franseria chamissonis var. bipinnatisecta)

Beach Bur, Silver Beachweed: Ambrosia chamissonis var. chamissonis (Synonyms: Franseria chamissonis ssp. chamissonis, Franseria chamissonis var. chamissonis)

Western Ragweed, Perennial Ragweed, Cuman Ragweed: Ambrosia psilostachya -

Giant Ragweed, Great Ragweed: Ambrosia trifida -


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