胡杨,人们也叫它异叶杨,大概是由于它的叶形多变,而得此名吧!它长的叶形确实很有趣,一棵树上可以生长着几种截然不同的叶子。种子刚发芽出土的小苗,子叶是圆的,真叶是细长的,长成大树叶子却成了多种多样,千姿百态。幼树叶形窄而长,宛似柳叶;树长大后,下部为柳形叶,上部却生长着齿形圆叶,或是齿形三角叶和倒卵形叶片;中部则是长披针形叶和卵圆形叶参差生长,甚至一根枝条上,前面叶圆,后面则 Populus euphratica, also known as the leaves of Populus euphratica, is probably due to its leaf-shaped change, and got its name! Its long leaf shape is indeed very interesting, a tree can grow several distinct leaves. Seed germination unearthed seedlings, cotyledons are round, true leaves are slender, grow into a large tree leaves have become diverse and varied. Young leaves narrow and long, Wan like willow; trees grow up, the lower part of the willow-shaped leaves, the upper part of the growth of toothed leaves, or triangular leaves and obovate-shaped leaves; the middle is long-lanceolate leaves and Grouped growth of oval leaves, and even a branch on the front of the leaf round, then it is