Agraulis vanillae (Gulf Fritillary butterfly) on Spiranthes cernua (Nodding Ladies'-tresses orchid)

A day trip to the Blue Ridge Parkway in North Carolina. I was lucky enough to find a nice bed of Spiranthes cernua beside the road. So, I stopped to photograph it and was soon joined by a Bee and a Butterfly. What a great day...

I cannot verify that this butterfly is a valid pollinator for this orchid species, since I did not see pollinia attached to its proboscis. But, it spent a lot of time on the flowers, taking nectar from each flower on the inflorescence.