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从果树进化的观点看,梨届植物大致可分为杜梨组和真梨组,前者原始后者进化。由于生态环境变化和地理隔离,梨属植物在演化过程中形成了东方梨和西方梨两大类。东方梨分布于亚洲,多数在中国;西洋梨主要在欧洲,中国引入1种。东方梨类中国有13种,豆梨为原始类型,其次是杜梨和褐梨,再次为川梨和滇梨。木梨、麻梨和河北梨为中间类型。沙梨、白梨和秋子梨是高级类型。杏叶梨是同源三倍体植物,可能是木梨的近缘种,经演化形成的次生种,新疆梨的性状界于东方梨与西洋梨之间,可能是白梨与西洋梨天然杂交后形成的次生种。
From the perspective of the evolution of fruit trees, pear plants can be divided into Du pear group and Zhen pear group, the former the original evolution of the latter. Due to the change of ecological environment and geographical isolation, Pyrus spp. Formed two major categories of Oriental pear and Western pear in the evolutionary process. Oriental pear distributed in Asia, mostly in China; Pear mainly in Europe, China introduced a species. Oriental Pear There are 13 species of Pear, Pear is the original type, followed by Du pear and brown pears, once again Chuan pear and Dian pear. Wood pear, pear and Hebei pear for the middle type. Saar, white pear and autumn pear is the advanced type. Apricot Pear is an autotriploid plant, which may be the relative species of Agrimony. The secondary species evolved from the evolution. The traits of Xinjiang pear are between Oriental Pear and Pear, which may be natural hybrid between Pear and Pear After the formation of secondary species.