Nigel Cattlin / Scarlet pimpernel (Anagallis arvensis). England, UK. September.

Nigel Cattlin / Scarlet pimpernel (Anagallis arvensis) growing as arable weed. England, UK. September.

Stephen Dalton / Scarlet pimpernel (Anagallis arvensis) in flower, Sussex, UK

Nick Upton / Bog pimpernel (Anagallis tenella) flowers and flowerbuds in marshy grassland, Devon, UK, June.

Nick Upton / Bog pimpernel (Anagallis tenella) flowering in marshy grassland, Devon, UK, June.

Nick Upton / Scarlet pimpernel (Anagallis arvensis) growing on seashore at the base of a cliff, Cornwall, UK, September.

Alex Hyde / Scarlet Pimpernel (Anagallis arvensis) Devon, UK. June.

Paul Harcourt Davies / Scarlet Pimpernel (Anagallis arvensis) in flower in garden at Podere Montecucco, Orvieto, Umbria, Italy, July.

Paul Harcourt Davies / Scarlet Pimpernel (Anagallis arvensis) in flower in garden at Podere Montecucco, Orvieto, Umbria, Italy, July.

Colin Varndell / Bog pimpernel (Anagallis tenella) in flower. Studland Heath, Dorset, UK July

Paul Harcourt Davies / Scarlet Pimpernel (Anagallis foemina) blue form close-up of stamens, in a garden, Orvieto, Italy, May

Nigel Cattlin / Scarlet pimpernel (Anagallis arvensis), red flowering annual arable weed in waste ground, Berkshire, July