E-Mail IMAGE: The study shows that even species that are considered widespread, such as the corn poppy (Papaver rhoeas), are steadily declining in Germany. view more Credit: Sebastian Lakner In an area covering the whole of Germany, in every grid field of approximately 5 by 5 kilometres - the decline in species diversity averages around two percent per decade. Especially vulnerable are the archaeophytes; species brought to Germany by humans but before the discovery of America. Among others, these include a large proportion of accompanying field flora, such as the corn marigold and...