| 11. | The male pollen cones are narrowly cylindrical and resemble catkins.
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| 12. | The flowers are wind-pollinated catkins, produced in early spring.
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| 13. | The dioecious with male and female catkins on separate plants.
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| 14. | They characteristically infect leaves, catkins, and branches, not roots.
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| 15. | Its reproductive structures are monoecious catkins similar to other birches.
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| 16. | The staminate inflorescences are panicles consisting of several erect catkins.
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| 17. | The inflorescence is a catkin of flowers up to 8 cm long.
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| 18. | I could not find out if hazel leaves and catkins are edible.
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| 19. | Both flower types are borne in catkin-like spikes.
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| 20. | The catkins grow before the leaves appear in the spring.
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