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Asclepias exaltata L.
Spotted on Auger Hole trail in Gorges State Park, NC
Thank you for the suggestion, but I think it is a Milkweed. The 'tooths' on the Hoya multiflora protrude out, while this flowers protrude inward.
Here is another link to the milkweed with more photos: http://wisplants.uwsp.edu/scripts/detail...
Here is a link to the Hoya multiflora: http://commons.wikimedia.org/wiki/File:H...