Anagallis tenella known in Britain as the bog pimpernel, is a low growing, perennial plant found in a variety of damp habitats from calcareous dune slacks to boggy and peaty heaths in Eurasia but absent from North America. In the UK it is mostly restricted to the western half of the country although it was more common in the east prior to land drainage and intensification of farming in the east of the country. 
Traditionally included in the family Primulaceae, the genus Anagallis was considered to be better placed within the related family Myrsinaceae. In the APG III system, Primulaceae is expanded to include Myrsinacae, thus Anagallis is now in Primulaceae again.
In England this plant is a component of the Purple moor grass and rush pastures BAP habitat.
- "BSBI List 2007" (xls). Botanical Society of Britain and Ireland. Archived from the original on 2015-01-25. Retrieved 2014-10-17.
- Preston c.D; Pearman D.A; Dines T.D (2002). New Atlas of the British and Irish Flora. Oxford University Press.
- Mari Källersjö; Gullevi Bergqvist; Arne A. Anderberg (2000). "Generic realignment in primuloid families of the Ericales s.l.: a phylogenetic analysis based on DNA sequences from three chloroplast genes and morphology". American Journal of Botany. American Journal of Botany, Vol. 87, No. 9. 87 (9): 1325–1341. doi:10.2307/2656725. JSTOR 2656725. PMID 10991903. (full pdf.text)
- Stace, Clive (2005). Flora of the British Isles. Cambridge University Press.
- Ulrika Manns; Arne A. Anderberg (2005). "Molecular Phylogeny of Anagallis (Primulaceae) Based on ITS, trnL-F, and ndhF Sequence Data". International Journal of Plant Sciences. 166 (6): 1019–1028. doi:10.1086/449318.
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