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Japan clover

noun
  1. a drought-resistant bush clover, Lespedeza striata, of the legume family, introduced to the southern Atlantic states from Asia, having numerous tiny trifoliate leaves valued for pasturage and hay.
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Origin of Japan clover

An Americanism dating back to 1865–70
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018