Peter Hoch and Quinn Long.
Wild lettuce in seed. The second and third pictures are better.
leaves auriculate and not prickly, involucre 12-15 mm, immature achenes - beak 2 mm, achene 6.5 mm
9999 red wild lettuce
tall plant >5'
Lactuca canadensis is a species of wild lettuce known by the common names Canada lettuce, Canada wild lettuce, tall lettuce, and Florida blue lettuce. Its true native range is not clear, but it is considered to be a native of parts of North America. It can be found in other parts, and on other continents, as an introduced species.