Treacle Mustard

Ectypa plantarum ratisbonensium : Regensburg :Verfertiget und verlegt von Johann Mayr ... und gedruckt mit Zeitlerischen Schriften,1787-1793. biodiversitylibrary.org/page/59792960

Farm weeds of Canada Ottawa :Dept. of Agriculture,1923 biodiversitylibrary.org/page/20740432

Steve Hurst. Provided by ARS Systematic Botany and Mycology Laboratory. United States, Massachusetts.

Britton, N.L., and A. Brown. Provided by Kentucky Native Plant Society.

Description: English: An illustration from British Entomology by John Curtis. name Hemiptera: Pentatoma caerulea or Zicrona caerulea (Blue Shield-bug).The plant is Erysimum cheiranthoides (Treacle Worm-seed). Date: 1820s date QS:P,+1820-00-00T00:00:00Z/8. Source: https://www.biodiversitylibrary.org/. Author: John Curtis.

Description: Erysimum cheiranthoides subsp. cheiranthoides, syn. Crucifera erysimum E.H.L.Krause Original Caption Schotendotter, Crucifera erysimum. Date: 1796. Source: Figure from Deutschlands Flora in Abbildungen at http://www.biolib.de. Author: Johann Georg Sturm (Painter: Jacob Sturm).