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A "species" is a term used in the classification of trees to indicate a natural group of trees that belong to the same genus and share similar characteristics. For example, red maple (Acer rubrum) is a species of maple trees that have red flowers, fruits, and leaves in autumn. A species can be further divided into varieties or cultivars, which are subgroups that have distinct differences or traits that are inherited or selected. For example, Acer rubrum var. drummondi is a variety of red maple that has silver-white undersides of the leaves.

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