Unusual flower explained

Because a few of you commented on the unusual flower I used on Macro Monday, I thought I'd elaborate.

Please allow me to introduce you to my new tree! I've been looking for one of this variety for several years, but all the local nurseries seem to always be sold out. They recently opened a new, huge Menard's, which is a home improvement store. This new one has a garden center, which is where you will always find me! Looking around on Saturday, I found that they had 4 of these Red Flowering Dogwood trees. I had to have one! It is an early Mother's Day gift to me. We planted it on Sunday and that is where the interesting flowers are borne. Here are a few pictures so you can see what the tree looks like.