What Nuts are Closely Related to Walnuts? The Juglandaceae Family
                                
                                
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                                    4 min read                                
                            
                                According to the American Academy of Allergy, Asthma & Immunology, pecans and walnuts are closely related, leading to higher instances of cross-reactivity. This botanical relationship stems from their shared membership in the walnut family, Juglandaceae, which also includes other well-known nuts like hickories and butternuts.