Scarlet pimpernel (
Anagallis arvensis; also known as
red pimpernel,
red chickweed,
poorman's barometer,
poor man's weather-glass,
[1] shepherd's weather glass or
shepherd's clock) is a low-growing
annual plant found in
Europe,
Asia and
North America. Scarlet pimpernel flowers are open only when the sun shines.
