prairie clover

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.

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