Annual Bursage, Annual Bur-sage, Annual Burweed , Bur Ragweed, Flat-spine Bur-ragweed
Ambrosia acanthicarpa
Synonym: Franseria acanthicarpa
The photo above shows the inflorescence and a stem leaf of bur ragweed as seen along Washington Highway 14 at milepost 91 above the Avery Sand Pit.......October 7, 2006.
The photo above shows a close-up of the pinnatifid stem leaf of bur ragweed as seen along Washington Highway 14 at milepost 91 above the Avery Sand Pit........October 7, 2006.
Paul Slichter