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Deciduous and evergreen leaves First of all, leaves A and B have pretty much the same structure, right? Wrong. Leaf A is the pinnately compound leaf of Hercules-Club, Zanthoxylum clava-herculis  

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deciduous and evergreen leaves First of all, leaves A and B have pretty much the same structure, right? Wrong. Leaf A is the pinnately compound leaf of Hercules-Club, Zanthoxylum clava-herculis, bearing seven leaflets, while "Leaf" B is actually a stem from a Privet Bush, Ligustrum ovalifolium, bearing about 20 simple (undivided) leaves. I know that each of the Privet's green things is a leaf because at the base of each leaf's petiole there is a bud harboring next spring's leaf, and you'd never find a bud at the base of a leaflet, which is just a part of a leaf. Now for something easier: Leaf C is just a normal simple leaf ("simple" is the proper way to refer to a leaf that is not compound, or separated into distinct leaflets). It's the 5-lobed leaf of the Sweetgum tree, Liquidambar styraciflua. Leaf D is another compound leaf, but it's compound in a...

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