| Scientific name: | Lychnis flos-cuculi L. | |
| Synonym name: | Coronaria flos-cuculi A. Braun, Silene flos-cuculi (L.) Greuter & Burdet | |
| Swedish name: | Gökblomster | |
| German name: | Kuckuckslichtnelke | |
| Nederlandse naam: | Echte koekoeksbloem | |
| English name: | Ragged-Robin | |
| Family: | Caryophyllaceae, Pink Family, Nejlikväxter |
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| Life form: | Perennial | |
| Stems: | Height 30–60 cm; with sparse, short, quite rough hairs, sticky | |
| Leaves: | Opposite, basal leaves stalked, stem leaves stalkless; basal leaf blades narrowly spatulate, stem leaves’ narrowly lanceolate–long, with entire margins | |
| Inflorescence: | Cyme | |
| Flowers: | rose–violet red; petals 5, deeply 4-lobed; calyx tube is five-toothed with ten stamens | |
| Flowering Period: | June–July | |
| Fruits: | Capsule, greenish, 5-valved, 8–13 mm | |
| Habitat: | Springs, spring swamps, shores, damp shore meadows, road and field ditches, hay fields | |
| Distribution: | Common in southern and central Sweden, but also occur rarely in the north |
 Derivation of the botanical name: Lychnis, Greek lychnos, a lamp; in allution to the flame-colored flowers. flos-cuculi, flos, "flower;" cuculus, "cuckoo bird" Coronaria, corona (Latin), "crown"; coronaria, used for garlands, or pertaining for garlands. Silene, probably from Greek sialon, "saliva," referring to gummy exudation on stems, and/or named for Silenus, intoxicated foster-father of Bacchus (god of wine) who was covered with foam, much like the glandular secretions of many species of this genus.
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