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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.
In fact, monocots differ from dicots in four structural features: their leaves, stems, roots and flowers. Within the seed lies the plantâs embryo; it is here that the first difference between the two types can be seen. Whereas monocots have one cotyledon (vein), dicots have two.