Calystegia soldanella

The morning glory Calystegia soldanella (syn. "Convolvulus soldanella") is a species of bindweed known by various common names such as seashore false bindweed, shore bindweed, shore convolvulus and beach morning glory. It is a perennial vine which grows in beach sand and other coastal habitats in temperate regions across the world. It is also known as 'The Prince's Flower' after Prince Charles Edward Stuart who sowed it on the Island of Eriskay, Scotland, when he landed there in 1745 to lead the Jacobite rising.[E. Dwelly Gaelic Dictionary (1911)]
The plant bears fleshy stems, kidney-shaped leaves, and attractive morning glory flowers with corollas delicate pink to vivid lavender. They are insect-pollinated.
Distribution.
In North America "Calystegia soldanella" is found on the west coast and selected areas of the east coast. In the United Kingdom it is widespread on the sandy coasts of England and Wales, less common in Scotland and Northern Ireland. It is also widespread around the coast of Ireland.