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partridge pea

noun
  1. a North American plant, Cassia fasciculata, of the legume family, having yellow flowers and feathery compound leaves that fold shut when touched.
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Origin of partridge pea

An Americanism dating back to 1780–90; probably so called because its fruit provides food for partridges
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018