|Inflorescence, Anglesey sand-dunes|
Epipactis dunensis, the dune helleborine, is an herbaceous member of the family Orchidaceae. It is hardy and has a long fleshy rootstock. It flowers from June to August with an inflorescence up to 50 cm high. The fruit is a capsule, from which the light, microscopic seeds are spread by the wind.
Dune helleborine is a British endemic species and in Britain limited to three main areas in England and Wales, the sand-dunes of Anglesey, dunes on the Fylde coast and in the valley of the River Tyne where it has colonised old metal mine workings.