Cardamine amara

About

Cardamine amara, known as large bitter-cress, is a species of flowering plant in the family Brassicaceae. It is a perennial with upright, mostly unbranched, stems to 70 cm (28 in) tall, and leaves made up of between three and 13 leaflets. The flowers have petals that are 8–14 mm (0.3–0.6 in) long and are generally white, although sometimes pink or purple. It is found in damp places.

Summary from Wikipedia