WordReference Random House Unabridged Dictionary of American English © 2020
mule-ears  (myo̅o̅lērz′),USA pronunciation n., pl.  -ears.  (used with a sing. or pl. v.)
  1. Plant Biologyany of several composite plants of the genus Wyethia, of the western U.S., having large leaves and broad flower heads with yellow rays.
Also,  mule's-ears′. 

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