The Collaborative International Dictionary of English v.0.48:

gay-wings \gay-wings\ n.
   A common trailing perennial milkwort (Polygala paucifolia)
   of eastern North America having leaves like wintergreen and
   usually rosy-purple flowers with winged sepals.

   Syn: flowering wintergreen, gaywings, bird-on-the-wing,
        fringed polygala, Polygala paucifolia.
        [WordNet 1.5]