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(birches; family Betulaceae)

A genus of fast-growing and light-de-manding trees, some of which provide valuable, pale timber. Male flowers are borne in catkins, female flowers in clusters; and there is no perianth. The fruit is a small, winged nut. There are about 60 species, occurring in the northern temperate and Arctic regions.

Subjects: Plant Sciences and Forestry.

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