After several people have said this flower is possibly a Lilly, that gave a direction in which to start a search from. It looks like it is a Spider Lilly.
I used to have one of these in my yard in Louisiana. They bloom so quickly and then are gone. You have very interesting lighting going on here and I love that they are all in focus.
Really great flower; I agree that the lighting is difficult here - I have never used fill flash, but perhaps it is called for here? I can think of some software tools - Highlight slider / recovery in Aperture or levels / curves in Photoshop might be able to bring back some of the details in the blown highlights.
I recognized it as a lily by the single stalk and multiple flowers. Seeing the location where it was shot led me to find that it was in a swamp. Hmmmm, swamp lily? Sure enough.
Very pretty subject for this flower side challenge. One of the flowers is a little blown out in the highlights. That is hard to avoid when you have such a wide range of lighting as you had in front of you here. Not much could be done once the shot had been taken, but maybe you could recognize this situation in the future and either shade the flower or move it a little so that either all or none of it is in direct sunlight. I very often use my tripod to move water lilies that are just beyond my reach while I take the shot using one hand to hold the camera.
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