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Betula nigra 

River birch is a vigorous, fast-growing, medium-sized deciduous tree that is noted for its superb growth habit. Its pinkish red bark exfoliates to a lighter inner bark. Its brown flowers (male) are seen drooping while its green flowers (female) appear upright. River Birch is easily grown in medium to wet soils and a position of full sun to part shade. Grows to a height of 40-70ft. Requires low maintenance and has a drought tolerance.