These Woad (Isatis tinctoria) seeds have been collected today.
The leaves of the woad plant were used to produce a blue dye that the ancient Britons used as body paint when going into battle. Woad is also apparently an antiseptic and it is likely that it was used on wounds at the time. The seeds make a nice olive coloured dye.
Following bright yellow flowers in early summer, the blue-tinged seeds make an attractive display, held on tall stems above the foliage.