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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.
Leaf Type. LEAF TYPES. When discussing the structure of leaves, it is best to start in the most basic concept: Leaf Type. A leaf can be either simple or compound. This concept is determined by determining the position of the bud. SIMPLE - If the bud is located in the axil (where the petiole attaches to the stem) of a single leaf. COMPOUND - The leaf is divided into multiple leaflets. Simple (left) and Compound (right) leaf types . Simple Leaf. A simple leaf is a single leaf that attaches to the stem. Palmate Leaf. A palmate leaf is a compound leaf that has smaller leaflets attaching to a common point. The whole structure is palm-like and shaped like the palm of your hand. Pinnate Leaf