Silene csereii

Silene csereii, the Balkan catchfly, is a species of flowering plant found in countries surrounding the Black Sea and northern Caspian Sea. It is also widely introduced to central Europe, Scandinavia, Britain, southern Canada and the northern United States.

Description
Silene csereii reaches 25 - 55 cm tall. The leaves are opposite and entire. The inflorescence is 15 - 20 cm long, comprising a number of bisexual flowers, each with a white corolla 4 - 5 mm wide.