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..Nevertheless, there is one detail that has tantalized scholars. The tall plants with yellow heads of grain have been interpretated by some as corn or maize from the Americas. This would indeed be remarkably early for their inclusion in European imagery; nevertheless, recent techncal examinations have concluded that the passages where this appears to be the clearest is in fact a replacement from the 1800s..
https://art.thewalters.org/detail/35961/adam-and-eve/