milk thistle flower on white background, top view. thistle flower and leaves with prickles

milk thistle flower isolated white background top view leaves prickles cirsium spiked pricker barb collage spike prick branch botanical pistil natural lay cardo mariano prickle closeup stem wild purple bud leaf nature herbal green blossom silybum marianum mix herb uncultivated weed twig flat variety head medicinal pattern pink treatment plant