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Leaf Classification1 Scientists often identify plants by examining their flowers or fruits, however leaves are often useful to identify a plant (think of poison ivy, croton, grapes, etc.). In order to identify a plant based on its leaves, it is helpful to recognize the diversity of leaf types and know the terminology for different leaf patterns, shapes and arrangements. Simple leaf pattern Simple leaves are whole, undivided leaves growing from a bud on the stem. The node is the part of the stem where leaves are attached. Compound leaf patterns Compound leaves are divided into leaflets, growing from one axillary bud on the stem. 1 Drawings by artist and FTBG volunteer Betty Packler. Compound leaf patterns continued… Leaf arrangement Nodes can have one leaf or many leaves, often in the following arrangements: Alternate (one leaf/node) Opposite (two leaves/node) Whorled (three or more leaves/node) Basic leaf shapes Ovate (widest near base) Obovate (widest near apex) Elliptic (widest near middle) Oblong (parallel sided) Leaf margins Entire Entire Dentate Lobbed Serrate Compound Erose serrate Crenate