The genus name Anagallis comes from the Greek words for "to delight in again," which is a reference to the plant closing its flowers as inclement weather approaches and opening them again once clouds have passed. This is also where the common names Poor Man's Weather-glass and Poor Man's Barometer originate. There is apparently a blue-flowered subspecies (Anagallis arvensis ssp. foemina) that is common in some parts of the geographical range, but I have never seen it. Scarlet Pimpernel can be found along roadsides, in gardens, in waste areas, and in pastures.