scarlet pimpernel(redirected from poor mans weatherglass)
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A pimpernel (Anagallis arvensis) having small flowers that are usually red but may be blue or white.
(Plants) a weedy primulaceous plant, Anagallis arvensis, of temperate regions, having small red, purple, or white star-shaped flowers that close in bad weather. Also called: poor man's weatherglass or shepherd's weatherglass
pim•per•nel(ˈpɪm pərˌnɛl, -nl)
any plant belonging to the genus Anagallis, of the primrose family, esp. A. arvensis (scarlet pimpernel), having scarlet or white flowers that close in bad weather.