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Genus Betula
- a genus of trees of the family Betulaceae (such as birches)
Genus Carpinus
- mostly deciduous monoecious trees or shrubs: hornbeams; sometimes placed in subfamily Carpinaceae
Genus Ostrya
- deciduous monoecious trees of Europe and Asia and America; sometimes placed in subfamily or family Carpinaceae
Genus Ostryopsis
- deciduous monoecious shrubs of China and Mongolia resembling trees of the genus Ostrya; sometimes placed in subfamily or family Carpinaceae
Genus Corylus
- deciduous monoecious nut-bearing shrubs of small trees: hazel; sometimes placed in the subfamily or family Corylaceae
Genus Centaurium
- genus of low-growing herbs mostly of northern hemisphere having flowers with protruding spirally twisted anthers
Genus Eustoma
- small genus of herbs of warm regions of southern North America to northern South America
Genus Exacum
- genus of tropical Asiatic and African plants: especially Persian violets