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Aquatic and Wetland Vascular Plants of the Northern Great Plains

Betulaceae, the Birch Family


Monoecious trees or shrubs. Leaves alternate, stipulate, serrate, pinnately veined. Flowers much reduced and imperfect; the male and female flowers produced in separate catkins on the same individual. Flowers 3 per scale in the catkin; perianth none; stamens 2-10; carpels 2, each with a stigma and style, ovary 2-celled, 4-ovuled. Fruit a winged nutlet, 1-seeded by abortion.

Lead Characteristic Go To
1 Catkins in terminal clusters of 3-several; pistillate scales unlobed. Genus Alnus
1 Catkins borne singly; pistillate scales 3-lobed. Genus Betula


11. Betulaceae, the Birch Family
1. Alnus P. Mill. -- Alder
1. Alnus incana (L.) Moench -- Speckled alder
2. Betula L. -- Birch
1. Betula glandulosa Michx. -- Dwarf birch, swamp birch


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