Larger plants and larger flowers than the usual Silene gallica I see.
Flowers with 4 and 6 stamens
Jepson eFlora:
6' Basal leaves rosetted, persistent
Stamens 4(6); pedicels erect to ascending ; fruit generally appressed , glabrous; seeds margined ..... C. hirsuta
7' Stamens 6; pedicels ascending to spreading ; fruit generally not appressed, sparsely hairy or glabrous; seeds not margined ..... C. oligosperma