[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

Updated October 12, 2022

Annual Ragweed, Bur Ragweed, Common Ragweed, Flat Spine Bur-ragweed: Ambrosia artemisiifolia (Synonym: Franseria acanthicarpa) -

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)

Cuman Ragweed, Perennial Ragweed, Western Ragweed: Ambrosia psilostachya (Synonyms: Ambrosia psilostachya var. californica, Ambrosia psilostachya var. coronopifolia, Ambrosia psilostachya var. lindheimeriana, Ambrosia rugelii) -

Giant Ragweed, Great Ragweed: Ambrosia trifida (Synonyms: Ambrosia aptera, Ambrosia trifida var. integrifolia, Ambrosia trifida var. texana, Ambrosia trifida var. trifida) -


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