Knotted Clover?

Knotted Clover?

Observation - Knotted Clover? - UK and Ireland. Description: Not sure what this is - compact flower-heads dark purple-brown. trifoliate leaves have whitish marks bigger than the cresent shape on Red clover leaves. all but last photo taken May 2nd. Last taken May 4th; revisiting the site noticed Red clover in flo

Not sure what this is - compact flower-heads dark purple-brown. trifoliate leaves have whitish marks bigger than the cresent shape on Red clover leaves. all but last photo taken May 2nd. Last taken May 4th; revisiting the site noticed Red clover in flower next to unknown, adds useful size comparison.