This species with a sub-Atlantic distribution is present in almost all regions of Northern Italy (missing in Valle d'Aosta, Trentino-Alto Adige and Emilia-Romagna), in Tuscany and in Sardinia, but is generally rare and declining. It grows on humid, muddy soils, from sea level to about 500 m. It is indicated in the Regional Red Lists as a critically endangered species (Conti et al., 1997). The genus name Lysimachia comes from Lysimachus, an ancient Greek physician; the genus name of the synonym (Anagallis) is derived from the Greek 'ana' (again) and 'agallein' (give joy), for the continuous, bright flowering; the species name refers to the frail and delicate appearance of the plant. Flowering period: June to July. Syn.: Anagallis tenella (L.) L.

Italian name(s): Anagallis tenera (Italia), Centonchio palustre (Italia).