Assertion: shirley poppy | /r/HasProperty | papaver rhoeas
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text: Other poppies, such as the California poppy ( Eschscholzia californica), the Mexican poppy ( Argemone mexicana), the Oriental poppy ( Papaver orientale), and the common "corn poppy" or "field poppy" of Europe, the progenitor of the Shirley poppies ( Papaver rhoeas), have been analysed and other kinds of alkaloids found in them, but not morphine.