What does "red pimpernel" mean?

herb with scarlet or white or purple blossoms that close at approach of rainy weather

Red pimpernel

Common synonyms include: anagallis arvensis, pimpernel, pimpernels, poor man's weatherglass, scarlet pimpernel.

Rare ·Advanced level

Noun

1
herb with scarlet or white or purple blossoms that close at approach of rainy weather wordnet