Delicate perennial of the Primulaceae family, long known as Anagallis tenella, this species is native to Western and Atlantic Europe, from Ireland and Great Britain to the Iberian Peninsula and the western Mediterranean rim. It occupies low bogs, seepages, spring edges, and spongy meadows constantly saturated with water, generally in plains and low mountains.
It forms a creeping and threadlike carpet of great finesse, with slender stems rooting at the nodes and barely exceeding 2 to 5 cm in height. The leaves are tiny, round to oval, tender green and translucent, arranged in opposite pairs along the stems, giving the plant an almost mossy appearance.
The flowers are solitary, borne on slender erect peduncles, pale pink to deep pink, star-shaped funnel, remarkably delicate for a plant in such a demanding environment. In its natural habitat, its flowering extends from June to August.
"In cultivation, it requires a constantly moist to waterlogged, peaty or acidic sandy substrate, in partial shade or filtered light. It is suitable for bog plant containers, wet basins, or the edges of water points with an acidic substrate. Its apparent fragility contrasts with its perfect adaptation to the most water-saturated conditions."