Bristly oxtongue, Helminthotheca echioides.
Flower is not unlike a dandelion but it’s the upstanding bristly nature of the plant, each bristle arising from a pimple, which helps identify it and makes it clear it really isn’t a dandelion! Leaves elliptical to oblong, wavy edged, pimply and bristly with winged stalks, upper leaves un-stalked and clasping the stem.
