Betula cordifolia, the mountain paper birch or heartleaf birch (also known as mountain white birch or eastern paper birch) is a birch species native to Eastern Canada and the Northeastern United States. Until recently it was considered a variety of Betula papyrifera (paper birch), with which it shares many characteristics, and it was classified as B. papyrifera var. cordifolia (Regel) Fern.

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