Golden Ragwort (Packera aurea) is in our garden. It is also known as Golden Groundsel and Butterweed. The photo #6 from Alex is really Goldenrod.
The Lady Bird Johnson website, wildflower.org, has this photo by Stephanie Brundage that is unrestricted.
There is also a photo on Wikimedia Commons by Chaile19 that is in the public domain.
Both are linked on this page.
