bird's-foot violet

noun
  1. a violet, Viola pedata, of the eastern and midwestern U.S., having single flowers with a yellow center, two purple upper petals, and three lavender lower petals: the state flower of Wisconsin.

Origin of bird's-foot violet

An Americanism dating back to 1830–40
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018