Silene vallesia can reach a height of. It is a perennial pubescent sticky plant with ascending flowering stems. Leaves are oblong-lanceolate, opposite, gradually smaller, long. Inflorescence is a raceme with only 1-3 flowers, long. The petals are pale pink, bifid, with deep oval lobes. Flowers bloom from June to August.
Distribution
This species is widespread throughout the western Alps to Apennines.