I'll send you this book for free:
If you are the first person to correctly identify this plant:
Actually, I said below that the leaves weren't radish-like but I guess they are kinda. The fine, dill-like leaves seem to be up around the flowers. So, this might be a wild forerunner of today's canola.
So, anyone want to take a guess?
Deadline is midnight July 31st.
If no one guesses the correct answer, I'll make a random draw on Aug 1st from all the people who commented on either of these 2 'yellow stuff' blogs or the same on FB and my eHarlequin blog because these are simulposted there.
Update: Lynne over on my eHarlequin blog correctly guessed wild mustard.