Apple Blossoms... the center one blooms first, and the other buds frame it for a few days before blooming on their own. You don't notice the aroma until you walk away from the tree and something is missing...
I still laugh when I see this image... I just can't believe how far this bumble bee stuck his head into this tiny little flower! He just grabbed hold with his little feet and SNNNOOORRRKK!!! It must have been an especially good vintage don't you think?