Silene gallica is a species of flowering plant in the family Caryophyllaceae known by several common names, including common catchfly, small-flowered catchfly, and windmill pink. It is native to Eurasia and North Africa, but it can be found throughout much of the temperate world as a common roadside weed.

Silene gallica is an erect or semi-erect annual herb growing up to 50 cm (20 in) tall, its branching stem clad in long, curling hairs and shorter, glandular hairs. The opposite, entire, lance-shaped leaves have acute apexes, are up to 3.5 cm (1.4 in) long on the lower parts of the plant, and smaller on the upper parts. The flowers grow in a terminal inflorescence at the top of the stem, and some appear in the leaf axils. Each flower has a tubular calyx of fused sepals lined with ten green or purple-red veins. The calyx is coated in long, sometimes glandular, hairs and becomes inflated in fruit. There are five white, pink, or bicolored, spatulate petals, each with a small appendage at the base. There are ten stamens and three styles. The fruit is a brown, ovoid capsule with six apical teeth.

Native to Europe, this species has a submediterranean/subatlantic distribution. In the British Isles, it mostly occurs near the coast of England, Wales, Scotland, and Ireland, but also sporadically inland. It is found in sandy or gravelly, often acidic, soils in arable fields, on wasteland and on walls, as well as poor dry pastures on the coast, and on sand dunes in the Channel Islands.

This plant has been in long-term decline, especially in the more northern parts of Europe, and is no longer present in many inland sites in Britain and Ireland, with a population reduction of 80% in the last ten years reported in 2006. This may be due to changes in agriculture practices, or it may perhaps be affected by climate change. It is listed as a UK Priority Species, and the Great Britain Red Data List ranks it as endangered.

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