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The plant morphologist goes further, and discovers that the spines of cactus also share the same basic structure and development as leaves in other plants, and therefore cactus spines are homologous to leaves as well. This aspect of plant morphology overlaps with the study of plant evolution and paleobotany.hese two systems are common to nearly all vascular plants, and provide a unifying theme for the study of plant morphology. By contrast, the reproductive structures are varied, and are usually specific to a particular group of plants.
Monocot vs Dicot Leaves. A leaf is attached to the stem of a plant at the node. The distance between two adjacent nodes is the inter node. Some leaves are attached to the stem by a stalk or a petiole. Some do not have stalks. Therefore, they are called sessile. In dicot leaves, the petiole continues as the midrib forming a network of veins.