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在苹果属植物中，变叶海棠（Ｍａｌｕｓｔｏｒｉｎｇｏｉｄｅｓ（Ｒｅｄｈ．）Ｈｕｇｈｅｓ）不同形态类型间，其耐盐、耐旱、耐热、耐涝，抗腐烂病和根腐病等都呈明显的多样性差异。在其主要分布区内，有陇东海棠和花叶海棠（或其中之一）零星分布。它们在四川西部和甘肃东南部汇集，表现为地理亲缘，其分布区的分异，表现为地理替代（含垂直替代）。变叶海棠以兼性无融合生殖方式与陇东海棠和花叶海棠产生渗入杂交变异，又以无融合生殖方式保持新产生变异的遗传，经数千万年的世代繁衍，不断增加种群的多样性，促进物种的分化与进化。
Among the apple genus Malus species (Redh.) Hughes, there were significant differences in their tolerance to salt, drought, heat, water logging, rot decay and root rot . In its main distribution area, there are scattered Eastern Begonia and Begonia (or one of them) sporadic. They converge in the western Sichuan and southeastern Gansu provinces. They are characterized by geography and kinship. Their geographical distribution is characterized by geographical substitution (including vertical substitution). Mutant Begonia with facultative apomictic reproductive methods and Longdong Begonia and Mosaic Begonia produce infiltration of hybrid variation, but also to apomictic way to maintain the genetic variation of new generation, after tens of millions of generations multiply, increasing population diversity Promote the differentiation and evolution of species.