Three-variable (A-2-B-3/3, A-1-B-4/4, C-4-D-4-4/4) MDA classification matrix of teosinte and Mexican maize samples (direct method).

1MDA is sensitive to unequal sample sizes, so 30 of the teosinte samples were used as "Knowns" and the remaining 15 were used as "unknowns", a recommended procedure for cases like this [16 p51].1MDA对不均衡样本量较为敏感，因此将30份类蜀黍样本设为“已知样本”，剩余15份设为“未知样本”，该操作流程为此类情形下的推荐方案[16，第51页]。