"Lantana camara", or Lantana. A well known weed of coastal areas. This image from my early career as a bush walker in the area as I enjoyed the vivacious flowers. See next image, as the flowers change from yellow in colour to pink and red with age. Often found near water, or in dry river beds. Have prickly and really obnoxious stems. Distinctive fragrance to the quite pretty flowers.
Wooli wildflowers August 12 11