桑。heterophylly

“The possession of two or more leaf types, often differing widely in morphology and function. For example, certain species of Lycopodium and Selaginella have two rows of expanded lateral leaves and one or two rows of smaller adaxial or abaxial leaves. Many aquatic and semiaquatic plants have dissected submerged leaves and entire floating or aerial leaves (see illustration). The submerged leaves are adapted to reduce resistance to water flow while the floating leaves have a broad lamina to maintain buoyancy.”。

还有一些树叶类似。女孩青春期看中医常开的“益母草浸膏汁”，那药瓶标签上也许有益母草的画片，一株益母草其顶端、中间、基部三处的叶子形状都不同的。