Yarrow flowers come in big clusters and in different colors of white, red, purple,pink and yellow as far as I know. The internet is a wonderful place to find information, but it is also very misleading too.
I've tried my best to match the description to the photos I had, and that is all I can do. I would love if someone correct me for the wrong posting here. These flowers were grown in my friend's garden, but she had no idea what they are.
Cluster of Yarrow Flowers
These photos were taken in May 2010 and were not the best. However, since they matched the description of yarrow flowers, I had to dig them up. Now, I can say that I finally found a name for their beautiful little face.