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45 - Corylaceae

from Division 5 - Magnoliophyta

Peter Sell  and
Gina Murrell
Peter Sell
Affiliation:
University of Cambridge
Gina Murrell
Affiliation:
University of Cambridge
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Summary

Deciduous, monoecious trees or shrubs. Buds with scales. Leaves alternate, simple; stipules caducous. Flowers in unisexual anemophilous catkins. Male catkins pendulous, with one flower in the axil of each bract; bracteoles 2, united with the bract, or absent; perianth absent; stamens 3–14. Female catkins of 2 flowers in the axil of each bract; bracteoles present; perianth small, irregularly lobed; ovary with 2 loculi, inferior; styles 2. Fruit a nut, subtended or surrounded by an involucre formed from the accrescent bract and bracteoles.

Contains 4 genera and over 50 species in north temperate regions and central America.

  • Buds ovoid, obtuse at apex; leaves usually with 5–12 pairs of veins; fruits in clusters of 1–10 3. Corylus

  • Buds fusiform to ovoid, acute at apex; leaves with 9 or more pairs of veins; fruits numerous, in pendulous spikes 2.

  • Bark grey, generally smooth; male catkins appearing in spring; nuts subtended by a 3-lobed or serrate involucre 1. Carpinus

  • Bark becoming scaly and rough; male catkins visible throughout the winter; nuts enclosed in an entire, bladder-like, apiculate involucre 2. Ostrya

    • Carpinus L.

    Deciduous, monoecious trees or shrubs. Bark grey, smooth. Buds fusiform or ovoid, acute at apex. Leaves alternate, with 9 or more pairs of veins, simple; stipules caducous. Flowers in unisexual catkins. Male catkins pendulous; one flower in the axil of each bract, without bracteoles; perianth absent; stamens about 10, with bifid filaments. Female catkins pendulous and spike-like, with 2 flowers in the axil of each bract; each bract accompanied by 6 bracteoles; flowers with the perianth small and irregularly lobed; ovary with 2 loculi; styles 2. Fruit a nut, subtended by a lobed or serrate, strongly veined involucre.

    Contains over 25 species in the north temperate regions and central America.

    Type
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    Flora of Great Britain and Ireland , pp. 355 - 364
    Publisher: Cambridge University Press
    Print publication year: 2018

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    • Corylaceae
    • Peter Sell, University of Cambridge, Gina Murrell, University of Cambridge
    • Book: Flora of Great Britain and Ireland
    • Chapter DOI: https://doi.org/10.1017/9780511980091.060
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    • Corylaceae
    • Peter Sell, University of Cambridge, Gina Murrell, University of Cambridge
    • Book: Flora of Great Britain and Ireland
    • Chapter DOI: https://doi.org/10.1017/9780511980091.060
    Available formats
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    • Corylaceae
    • Peter Sell, University of Cambridge, Gina Murrell, University of Cambridge
    • Book: Flora of Great Britain and Ireland
    • Chapter DOI: https://doi.org/10.1017/9780511980091.060
    Available formats
    ×