Honey Bee on a Yellow Flower

This summer, I was fascinated by some yellow flowers in the garden that seemed to hold an almost magical attraction to bees.

[caption id="" align="aligncenter" caption="Honey Bee on Yellow Flower"][/caption]

I took this picture using an extension tube and a tripod. The problem with this setup was that the area in which the image was sharp was about 3-4 mm in depth and there was a breeze blowing. The swaying of the flower made it go in and out of focus, so I lost quite a number of interesting pictures due to lack of sharpness.

Does anyone have an idea what the name of the flower is?