I have had a backlog of wildflowers from our summer travels that need to be identified. These happy yellow flowers were alongside the road in northern California on the Lost Coast back in June. I stopped the car alongside the road that was running parallel to the ocean and took these photos.
They had the unusual white sticky stuff on the plants which I thought would make it easy to identify but just yesterday, while looking for something else, I found what I think is the correct identification.
Coastal Gum-Plant or Grindelia stricta var. platyphylla
Great photos of the flower!