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Vigna Caracalla, a.k.a. Snail Vine or Corkscrew Vine.
This comes directly from the Thomas Jefferson Center for Historic Plants brochure:
Clusters of highly fragrant, white and purple flowers flushed with creamy yellow. The buds resemble a corkscrew or snail.
Vines grow to 20 feet in summer or year round in the green house. Prefers full sun to very light shade and rich, well drained soil with some organic matter. Can be grown in a container.
In 1792, Thomas Jefferson wrote to Benjamin Hawkins, “The most beautiful bean in the world is the Caracalla bean which, though in England a greenhouse plant, will grow in the open air in Virginia and Carolina. It was being grown in American gardens by the 1830s, when Robert Buist wrote in The American Flower Garden Directory “Snail-Flower is a very curious blooming plant with flowers … all spirally twisted, in great profusion when the plant is grown well.” This spectacular flower was popular in florists’ corsages by the late 19th century.
I don’t know if they still have any available, but I ordered mine from the Thomas Jefferson Center for Historic Plants website www.twinleaf.org. Anyone living in the South (USA) can see the flower grown in the Monticello gardens outside of Charlottesville Virginia, or go to www.monticello.com for more information on the gardens.