Before I made it into the safe sanctuary of the trees, I got waylaid oggling the edge of an arable field abutting the wood. One's eye is drawn to unfamiliar things and mine caught site of this little insignificant plant - a new plant to me - dwarf spurge, Euphorbia exigua.
Euphorbias were apparently named in honour of one, Euphorbus, who was a Greek physician to Numidian King (who lived in about 50BC). This Dr Euphorbus is reputed to have used a spurge plant to cure the king of a nasty swollen belly.
Hence the name 'spurge', which is from the old French 'espurge', which means, not surprisingly, to purge.