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 -