087 Anagallis arvensis L.
Nome comune: Centonchio dei campi; Bellichina; Mordi gallina; Primula rossa
Scarlet pimpernel (Anagallis arvensis; also known as red pimpernel, red chickweed, poorman's barometer, shepherd's weather glass or shepherd's clock) is a low-growing annual plant found in Europe, Asia and North America. The barometer (weather glass) common names have their origin in the fact that the flowers close when atmospheric pressure decreases and bad weather is approaching.
Although traditionally included in the family Primulaceae, the genus Anagallis is now considered to be better placed within the related family Myrsinaceae. In the APG III system, Primulaceae is expanded to include Myrsinaceae, thus Anagallis is in Primulaceae sensu lato.
This common European plant is generally considered a weed and is an indicator of light soils.
It is most well known for being the emblem of the fictional hero The Scarlet Pimpernel.