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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.
Opposite. A plant with pairs of leaves attached at each node opposite to each other has an opposite leaf arrangement. This leaf arrangement has two types, decussate and distichous. If the pairs of leaves are rotated 90 degrees as they advance up the stem, the opposite leaf arrangement is considered descussate.