Monarda or Bee Balm bud. I was amazed to see these colors when I saw the image on my monitor. I took the picture in the evening, with soft backlighting from a western sky.
Nikon D300, Sigma 105mm macro, f11 (relative) 1/20 sec., ISO 500, manual focus and exposure, tripod. PP: PS7--basic adjustments (no saturation increase), soft light adj., Topaz Denoise, used clone tool to even out bg colors.