Walther Müller, Illustration of Opium Poppy, Papaver somniferum, from Köhler’s Medizinal-Pflan
Walther Müller, Illustration of Opium Poppy, Papaver somniferum, from Köhler’s Medizinal-Pflanzen Atlas, 1887. Gera, Germany. Biodiversity Heritage Library -- source link
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