unusual looking plant, spiky!

unusual looking plant, spiky!

Observation - unusual looking plant, spiky!. Description: Came across this unusual looking plant in a small patch of 'wilderness' close to a park in Hampton. Leaves have serrated edges, small spikes in the surface of the leaves too, and quite a prickly ball-shaped flower starting to emerge. Any idea what it is,

Came across this unusual looking plant in a small patch of 'wilderness' close to a park in Hampton. Leaves have serrated edges, small spikes in the surface of the leaves too, and quite a prickly ball-shaped flower starting to emerge. Any idea what it is, please? There were only 2 or 3 of them.