Cracking a Tough Nut (IMAGE)
Caption
Nut photos of three different walnut species, J. mandshurica (Manchurian), J. nigra (black) and J. regia (Persian), that were used in the study show clear differences among the outer shells of the species. The Persian walnut (Juglans regia) is an important economic crop and one of 22 species in the genus Juglans, which includes black and white walnuts and butternuts, grown across Europe, the Americas and Asia.
Credit
Department of Biology, Systematic Botany and Mycology, University of Munich (LMU), Munich, Germany
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