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prairie clover

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noun
  1. any plant belonging to the genus Petalostemon, of the legume family, common in western North America, having pinnately compound leaves and spikes of white, purple, or pink flowers.
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Origin of prairie clover

An Americanism dating back to 1855–60
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018