[Ragweeds: The Genus Ambrosia West of the Cascade Mountains of Oregon and Washington]

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

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

Cutleaf beach bur as seen on the cobbles of the upper beach at Oceanside, OR........June 19, 2010.

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 (Synonym: Franseria chamissonis var. bipinnatisecta)

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

Additional close-up views of cutleaf beach bur as seen on the cobbles of the upper beach at Oceanside, OR..................June 19, 2010.

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

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

What is probably the former Ambrosia chamissonis var. chamissonis on the beach at Oceanside, Oregon...........August 25, 2012. Note the silvery white leaves which are incised to deeply lobed. Ambrosia chamissonis var. bipinnatisecta was observed blooming next to this plant several feet away.

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

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

Close-ups of cutleaf beach bur, the former Ambrosia chamissonis var. bipinnatisecta on the cobble upper beach at Oceanside, Oregon...........August 25, 2012. This plant is only a few feet away from that of Ambrosia chamissonis var. chamissonis pictured directly above. Note the greenish-blue, bipinnatifid to tripinnatifid leaves.

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 as seen at the end of Jetty Road SW at the Bandon Jetty South Park, Bandon, Oregon..........April 18, 2016.

Paul Slichter