| General Information |
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| Distribution | A genus of about 65 species primarily of the Northern Hemisphere, extending south to Central America and Asia to Indonesia.
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Habit
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Dioecious or polygamous trees.
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Leaves
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Leaves odd-pinnately compound, opposite, leaflet margins serrate to undulate or subentire, petioles flat or grooved.
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Flowers
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Flowers unisexual or perfect, appearing before or with the leaves, in panicles; calyx small, 4-lobed, sometimes of 4 distinct sepals or absent; petals (2-)4(-6), rarely connate at base or absent; stamens 2(3), abortive in pistillate flowers; ovary 2-celled; style slender to broadened and compressed; stigmas 2.
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Fruit
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Fruit a samara, with 1 terminal wing.
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Seeds
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Seed 1, narrowly ellipsoid to oblong, terete or flat.
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