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22 - Pinaceae

from Division 4 - Pinophyta

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

Monoecious trees or shrubs, usually evergreen, sometimes deciduous. Leaves usually spirally arranged, sometimes appearing to be two-ranked or sometimes in tufts, needle- like. Male strobili cylindrical; microsporophylls with 2 microsporangia; pollen grains usually with 2 bladder-like wings. Cones conical or oblong, maturing in 1–2 years, usually large, erect or hanging; scales numerous, spirally arranged, woody, separated from the bracts, each bearing 2 inverted ovules. Seeds usually with one long wing projecting backwards. Cotyledons several to many.

Consists of 9 genera containing about 190 species mainly confined to temperate regions of the northern hemisphere.

  • Leaves deciduous 2.

  • Leaves evergreen 3.

  • Mature female cones remaining whole and falling intact 5. Larix

  • Mature female cones dismembering on tree 6. Pseudolarix

  • Leaves united in groups of usually 2, 3 or 5 by sheaths at the base 8. Pinus

  • Leaves not united in groups 4.

  • Leaves distant on long shoots and more clustered on short side shoots 7. Cedrus

  • Leaves all distant on long shoots; side shoots absent 5.

  • Shoots roughened after leaf abscission by persistent leafbases 6.

  • Shoots more or less smooth; leaf-bases not persistent 7.

  • Leaves shortly and distinctly petiolate, never pungent 3. Tsuga

  • Leaves sessile, mostly pointed and usually pungent 4. Picea

  • Winter buds ovoid, obtuse at apex; female cones erec 1. Abies

  • Winter buds spindle-shaped, acute at apex; female cones pendulous or variously orientated 2. Pseudotsuga

    • Type
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    Flora of Great Britain and Ireland , pp. 54 - 95
    Publisher: Cambridge University Press
    Print publication year: 2018

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    • Pinaceae
    • Peter Sell, University of Cambridge, Gina Murrell, University of Cambridge
    • Book: Flora of Great Britain and Ireland
    • Chapter DOI: https://doi.org/10.1017/9780511980091.033
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    • Pinaceae
    • Peter Sell, University of Cambridge, Gina Murrell, University of Cambridge
    • Book: Flora of Great Britain and Ireland
    • Chapter DOI: https://doi.org/10.1017/9780511980091.033
    Available formats
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    To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.

    • Pinaceae
    • Peter Sell, University of Cambridge, Gina Murrell, University of Cambridge
    • Book: Flora of Great Britain and Ireland
    • Chapter DOI: https://doi.org/10.1017/9780511980091.033
    Available formats
    ×