screw bean

  1. the spirally twisted pod growing on a mesquite tree (Prosopis pubescens) of the SW U.S., often used for fodder
  2. this tree

See screw bean in American Heritage Dictionary 4

noun In both senses also called tornillo.
  1. A shrub or small tree (Prosopis pubescens) of the southwest United States and adjacent areas of Mexico, having pinnately compound leaves, tiny yellowish-white flowers, and twisted pods used as fodder.
  2. The pod of this plant.
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