Class No. 1—100% Beech, European (Fagus sylva-tica) Dogwood, Pacific (Cornus nut-talln) Elm, American (Ulmus ameri-cana) Hawthorn, English (Crataegus oxyacantha)
Maple: Hedge {Acer campestre) Red (Acer rubrum) Vine (Acer circinatum) Oak: Northern Red (Quercus bo-realis) Pin (Quercus palustris) Scarlet (Quercus coccinea) Sweetgum (Liquidambar styraci-fiua) Tulip tree (Liriodendron tulipi-fera)
Class No. 2—80% Ash, Flowering (Fraxinus ornus) Cedar, Eastern Red (Juniperus virginiana) Fir, Common Douglas (Pseudot-suga taxifolia) Holly, English (Ilex aquifolium) Horsechestnut, Red (Aesculus earned) Locust, Black (Robinia pseudoa-cacia)
Maple: Norway (Acer platanoi-des) Silver (Acer sacchari-num) Sugar (Acer saccharum) Plane, London (Platanus aceri-folia) Plum: Blireiana (Prunus blireiana) Purple-leaf Myrobalan (Prunus cerasifera pis-sardii)
Class No. 3—60% Ash (Fraxinus sp.) Birch, European White (Betula pendula) Cypress, Lawson False (Cham-aecyparis lawsoniana) Ginkgo (Ginkgo biloba) Laburnum, Goldenchain (Laburnum anagyroides)
Class No. 4—40% Boxelder (Acer negundo) Linden (Tilia sp.) Poplar (Populus sp.) Willow, Babylon Weeping (Salix babylonica)