Creeping cinquefoil - Potentilla reptans

"Potentilla reptans", known as the creeping cinquefoil, European cinquefoil or creeping tormentil, is a plant in the Rosaceae family. Potentilla reptans can be an invasive weed in lawns and flowerbeds and difficult to eradicate, particularly when it competes with and infests established groundcovers. All of the taproots must be dug up, or the plant will reappear.