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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.
1 Monocots have one cotyledon. 2  Monocot leaves tend to have parallel veins; in dicots the veins are netted. 3  Monocot floral parts are in multiples of 3; dicots are based on 4's or 5's. 4  The vascular bundles in monocots stems are scattered; in dicots they form a ring surrounding the pith. Monocot leaves tend to have parallel veins; in dicots the veins are netted. 2  Monocot floral parts are in multiples of 3; dicots are based on 4's or 5's. 3  The vascular bundles in monocots stems are scattered; in dicots they form a ring surrounding the pith.