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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.
The arrangement of leaves depends very much on the particular lycophyte in question. Many club mosses have leaves which are attached in a spiral pattern, while in other creeping species the leaves are all oriented in the same plane.In some, the leaves are fused to the stem, giving them the appearance of tiny junipers. cross section of a member of the order Lycopodiales is shown above. You can see the large red xylem cells because they have been stained with a chemical which sticks to the lignin in the cell walls of that tissue. Notice that there are other kinds of tissues among the xylem.