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A family of trees in which the leaves are pinnate, with no stipules. The flowers are small, unisexual, and bracteate, and borne in spikes or catkins. They are wind-pollinated, and have an inferior ovary. The fruit is a drupe or nut, sometimes attached to a wing-like bract. The family yields several useful timbers (e.g. walnut and hickory) and fruits (e.g. walnut and pecan). There are 7 genera, with 59 species, most of which occur in northern temperate regions, but a few of which are tropical.

Subjects: Plant Sciences and Forestry.

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