For each complete study of a tree a Pinterest board has been created. If you have the Pinterest app on your device you can use the seach option and select the camera icon and then point the camera at desired tree(s) below to lookup the pins. 

alder / common (alnus glutinosa)

alder / cut leaved (alnus glutinosa 'Laciniata')

alder / grey (alnus incana)

alder / italian (alnus cordata)

alder / spaer (alnus x spaethii)

ash / common (fraxinus excelsior)

ash / manna (fraxinus ornus)

ash / narrow leaved (fraxinus angustifolia)

ash / single leaf (fraxinus angustifolia 'Veltheimii')

ash / weeping (fraxinus excelsior 'Pendula')

aspen (populus tremula)

atlas cedar / blue (cedrus atlantica 'glauca')

beech / common (fagus sylvatica)

beech / copper (fagus sylvatica f. purpurea)

beech / cut-leaf (fagus sylvatica asplenifolia)

birch / himalayan (betula utilis)

birch / silver (betula pendula)

buckeye / yellow (aesculus flava)

catalpa / yellow (catalpa ovata)

chestnut / sweet (castanea sativa)

Crap apple 'John Downie'

elm (exeter)

golden chain (laburnum)

handkerchief tree (davidia involucrata)

horse chestnut (aesculus hippocastanum)

horse chestnut / red (aesculus × carnea)

hornbeam (carpinus betulus)

indian bean tree (catalpa bignonioides)

larch / japanese (larix kaempferi)

lime / common (tilia × europaea)

lime / cut-leaved (Tilia platyphyllos 'laciniata​')

lime / large-leaved (tilia platyphyllos)

lime / silver (tilia tomentosa)

lime / small-leaved (tilia cordata)

locust / black (robinia pseudoacacia)

london plane (platanus × hispanica)

maidenhair (ginkgo biloba)

Maple / field (acer campestre)

Maple / norway (acer platanoides)

Maple / silver (acer saccharinum)

mulberry / black (morus nigra)

oak / english (quercus robur)

oak / lucombe (quercus x hispanica ‘lucombeana)

oak / pin (quercus palustris)

oak / turkey (quercus cerris)

pear / common (pyrus communis)

plum / purple leaf (prunus cerasifera nigra)

poplar / lombardy (populus nigra 'italica')

poplar / white (populus alba)

pride of india (koelreuteria paniculata)

redwood / dawn (metasequoia glyptostroboides)

redwood / giant (sequoiadendron giganteum)

rowan (sorbus aucuparia)

sycamore (acer pseudoplatanus)

tree of heaven (ailanthus altissima)

walnut / black (juglans nigra)

whitebeam / swedish (sorbus intermedia)

wild service tree (sobus torminalis)

willow / golden weeping (salix × sepulcralis var. chrysocoma)

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