White slumber, or white gum, wood cockle, soapwort, toothgrass, firecrackers, is a biennial herbaceous dioecious plant of the carnation family. The leaves of the plant are opposite, oval-lanceolate, pointed, slightly pubescent. The flowers are white, with a swollen, fused tubular calyx of five sepals and five corolla petals. The fruit is a capsule opening at the apex with ten teeth, containing numerous small seeds.