partridge pea

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

Origin:
1780–90, Americanism; probably so called because its fruit provides food for partridges

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
partridge pea

noun
tropical American plant having leaflets somewhat sensitive to the touch; sometimes placed in genus Cassia 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
In later stages of growth, partridge pea can be unpalatable and even toxic to
  cattle.
Quail favor annual plants such as ragweed, partridge pea and foxtail, although
  they'll eat a great variety of seeds and insects.
With the exception of partridge pea, false-foxgloves and a few others, annuals
  are rare in undisturbed prairie sod.
Partridge pea is another well-known bobwhite favorite, which reseeds itself
  well.
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