Hand-colored lithograph of common wallflower, Cheiranthus cheiri. Class Tetradynamia, order Siliquosa.
         
        
      
         Fitton, Sarah Mary, and Elizabeth Fitton. “Plate 15: Cheiranthus Cheiri.” In Conversations on Botany. London, England: Longman, Hurst, Rees, Orme, and Brown, 1817. https://digital.sciencehistory.org/works/m900nt45t.
      
      
        
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