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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.
Homology: Leave It To the Plants. In the following photos of plants, the leaves are quite different from the normal leaves we envision. Each leaf has a very different shape and function, yet all are homologous structures, derived from a common ancestral form.The pitcher plant and Venus' flytrap use leaves to trap and digest insects.The bright red leaves of the poinsettia look like flower petals.The cactus leaves are modified into small spines, which reduce water loss and can protect the cactus from plant-eaters.omology: Leave It To the Plants. In the following photos of plants, the leaves are quite different from the normal leaves we envision. Each leaf has a very different shape and function, yet all are homologous structures, derived from a common ancestral form.