wrote:
Hello,

I recently took this photograph and I am trying to identify it. The
closest I got was "Potentilla eriocarpa", but I don't this that is
correct.

The flower was growing in a small creek in Australia in Brisbane
Forest.

http://www.devsiden.info/images/gulblomst.jpg

If it were in the U.S., I would say Ludwigia in the Onagraceae.
That's an aquatic genus. Maybe there are some in Oz as well?

M. Reed