Silene regia is a species of flowering plant in the pink family known by the common name royal catchfly. It is native to the central United States. This perennial herb grows from a fleshy taproot. There are several erect stems growing up to 1.6 meters tall. The leaves are lance-shaped to oval and up to 12 centimeters long, becoming smaller farther up the stem. The inflorescence is an array of many flowers at the top of the stem. The elongate tubular calyx of sepals is up to 2.5 centimeters long and has 10 longitudinal veins. The lobes of the bright red corolla are 1 to 2 centimeters long. The flowers are pollinated by the ruby-throated hummingbird. This plant is similar to the other two red-flowered eastern North American Silene, S. virginiana and S. rotundifolia.