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List of trees of Great Britain and Ireland

Article Discussion

Template:Short description Many lists of trees of Great Britain and Ireland have been written. There are a number of issues surrounding the inclusion of a species in such a list. As can be seen from the outline of debate below, there is no 'correct' list of trees of Britain and Ireland.

File:Rowan tree 20081002b.jpg
Rowan tree in Wicklow, Ireland

Issues of debateEdit

Definition of speciesEdit

There are a number of different opinions regarding the validity of some species, notably apomictic microspecies and whether some 'species' may actually be hybrids. In particular, the number and definition of species in the genera Sorbus (rowans, whitebeams etc.), Ulmus (elms) and Salix (willows) are open to debate.

Definition of nativeEdit

Native species are considered to be species which are today present in the region in question, and have been continuously present in that region since a certain period of time. When applied to Britain and Ireland, three possible definitions of this time constraint are:

  • a species that colonised these islands during the retreat of ice at the end of the last ice age
  • a species that was present in these islands when the English Channel was created and the land bridge between Britain and continental Europe was flooded
  • a species that has colonised without human assistance; in some cases this is uncertain.

The only endemic tree species in Britain and Ireland (that is, that are native only to this region) are some apomictic whitebeams.

Species that were native in the region in prehistory before the last ice age, but not subsequently, are generally regarded as extinct and no longer native.

Many additional species have been imported by humans; the total list of all introduced trees numbers several thousand. A far smaller number of these have become widely naturalised, spreading by their own accord without recourse to further human assistance.

Definition of treeEdit

A tree can be defined as a large, perennial, woody plant with secondary branches supported by a primary stem (compare with shrub). There is no set definition regarding minimum size, though most authors cite a tree species as being one which regularly reaches 6 m (20 ft) tall with a single stem.<ref name=Mitchell>Template:Cite book</ref> Species like Blackthorn (Prunus spinosa) and Purple willow (Salix purpurea), which may reach 6 m but not on a single stem, are not treated as trees.<ref name=Mitchell/>

List of speciesEdit

File:Alnus glutinosa 011.jpg
Alnus glutinosa
File:Malus sylvestris 005.JPG
Malus sylvestris
File:Fraxinus excelsior tree.jpg
Fraxinus excelsior

Native treesEdit

Listing order follows taxonomic order per Mitchell 1974.<ref name=Mitchell/>

  • Yews
  • Junipers
    • Common Juniper (Juniperus communis; usually a shrub, but occasionally develops tree form<ref name=Mitchell/>)
  • Pines
  • Poplars
  • Willows (Salix spp.; several species, but mostly shrubs rather than trees)
  • Birches
  • Alders
  • Hornbeams
  • Hazels
    • Common Hazel (Corylus avellana; usually a shrub, but occasionally develops tree form<ref name=Mitchell/>)
  • Beeches
    • European Beech (Fagus sylvatica; native status disputed; did not reach Britain until over 2,000 years after the Channel formed, with Neolithic introduction likely, for its nuts as a food source)<ref>Harris, E. (2002) Goodbye to Beech? Farewell to Fagus? Quarterly Journal of Forestry 96 (2):97.</ref>
  • Oaks
    • Pedunculate Oak (Quercus robur)
    • Sessile Oak (Quercus petraea)
    • Hybrid Oak (Quercus × rosacea) - widespread as a natural hybrid between Q. robur and Q. petraea.<ref>{{#invoke:citation/CS1|citation

|CitationClass=web }}</ref>

Native large shrubsEdit

These larger shrubs occasionally reach tree height, but not on a single stem so do not qualify as trees:

Endemic speciesEdit

An endemic species is a plant only native to a certain area. Outside this area, unless spread naturally it is considered non-native, usually as a result of cultivation. Britain and Ireland have few endemic trees, most being micro-species of Whitebeam. But there are some interesting endemic trees nevertheless.

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Naturalised treesEdit

(Incomplete list)

Naturalised large shrubsEdit

(Very incomplete list)

Record British treesEdit

The tallest tree in Great Britain (and second-tallest tree in Europe) is a 103-year old Douglas-fir in North Wales, 71 metres tall<ref name=MT>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

See alsoEdit

ReferencesEdit

Template:Reflist

External linksEdit

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  • The Woodland Trust (UK conservation charity promoting woodland restoration and expansion.)
  • Forestry Commission (UK government department responsible for protection and expansion of Britain's forests and woodlands.)
  • Elwes, Henry John, and Henry, Augustine, 1906 The trees of Great Britain & Ireland BHL Monograph.Includes rare introduced trees.Seven volumes and seven volumes of excellent black and white plates.
  • Tree Council of Ireland Heritage trees

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