When a bee lands on the lower part of the flower, it swings away to reveal the pollen. As soon as the bee is gone, the pollen is again covered. Before the flower is ready to open, pink side pieces are covering the lower part. They swing up and away to the side when the flower is ready.
This image is available under either the GFDL version 1.3 or the CC-by-sa version 3.0. Essentially, this gives you the following rights:
If you want to use this image without attribution, I may offer you an alternate license in return for compensation. Contact me with a proposal.
Want to email me about this photo?
Remember, if the image is under a free license, you don't have to ask permission to use it within the terms of the license.