Wood Sorrel (Oxalis acetosella)
Co. Wicklow, Ireland, 1989

Wood sorrel can be seen on the tail-fins of Aer Lingus aircraft, and as there can be few locations more Irish than Glendalough, where this photo was taken, could this be the original shamrock?

Well possibly, but it's more likely that the most famous ancient Briton in ancient Ireland was referring to another plant entirely.

The word shamrock is derived from the Irish seamair óg, which means young clover.

Wood Sorrel