American Arborvitae (Thuja occidentalis)

Beech (Fagus)
  American Beech (Fagus grandifolia)
  European Beech (Fagus sylvatica)
      Copper Beech (Fagus sylvatica atropunicea)
      Dawyck Beech (Fagus sylvatica fastigiata)
      Fernleaf Beech (Fagus sylvatica asplenifolia)
      Rivers Beech (Fagus sylvatica 'Rivers')
      Tricolor Beech (Fagus sylvatica 'Tricolor')
      Weeping Beech (Fagus sylvatica pendula)
	  
Birch (Betula)
  European White Birch (Betula pendula) 
      Columnar White Birch (Betula pendula fastigiata)
      Cutleaf European Birch (Betula pendula gracilis)
  Gray Birch (Betula populifolia)
  Paper Birch (Betula papyrifera)
  
Buckthorn (Rhamnus cathartica)

Catalpa (Catalpa speciosa)

Cedar, Blue Atlas (Cedrus atlantica glacua)

Cherry (Prunus)
  Amanogawa Flowering Cherry (Prunus serrulata 'Amanogawa')
  Kwanzan Flowering Cherry (Prunus serrulata 'Kwanzan')
  Sargent Cherry (Prunus sargenti)
      Columnar Sargent Cherry (Prunus sargenti columnaris)
  Weeping Japanese Cherry (Prunus subhirtella pendula)
  
Cork-tree, Amur (Phellodendron amurense)

Crab-Apple (Malus)

Cryptomeria (Cryptomeria japonica)

Cucumber-tree (Magnolia acuminata)

Dogwood (Cornus)
  Alternate-leaf Dogwood (Cornus alternifolia)  
  Flowering Dogwood (Cornus florida)
      Pink Flowering Dogwood (Cornus florida rubra)
      Welch Flowering Dogwood (Cornus florida welchi)
  Kousa Dogwood (Cornus kousa)
  
Douglas Fir (Pseudotsuga taxifolia)

Elm (Ulmus)
  American Elm (Ulmus americana)
  Chinese Elm (Ulmus parvifolia)
  Christine Buisman Elm (Ulmus carpinifolia)
  Scotch Elm (Ulmus glabra)
  Siberian Elm (Ulmus pumila)
  
Fir (Abies)
  White Fir (Abies concolor)
  
Franklinia (Franklinia alatamaha)

Fringe-tree (Chionanthus virginica)

Ginkgo (Ginkgo biloba)

Goldenchain, Waterer (Laburnum watereri)

Goldenrain-tree (Koelreuteria paniculata)

Hardy Orange (Poncirus trifoliata)

Hawthorn (Crataegus)
  Cockspur Hawthorn (Crataegus crus-galli)
  Columnar Hawthorn (Crataegus monogyna stricta)
  Lavalle Hawthorn (Crataegus lavallei)
  Paul's Scarlet Hawthorn (Crataegus oxyacantha pauli)
  Washington Hawthorn (Crataegus phaenopyrum)
  
Hemlock (Tsuga)
  Canadian Hemlock (Tsuga canadensis)
      Sargent Weeping Hemlock (Tsuga canadensis pendula)
  Carolina Hemlock (Tsuga caroliniana)
  Japanese Hemlock (Tsuga diversifolia)
    
Holly (Ilex)
  American Holly (Ilex opaca)
  Dahoon Holly (Ilex cassine)
  Foster Holly (Ilex fosteri)
  Japanese Holly (Ilex crenata)
  Yaupon Holly (Ilex vomitoria)
  
Honey-locust (Gleditsia)
  Common Honey-locust (Gleditsia triacanthos)
  Thornless Honey-locust (Gleditsia triacanthos inermis)
  Sunburst Honey-locust (Gleditsia triacanthos inermis 'Sunburst')
  
Hornbeam (Carpinus)
  European Hornbeam (Carpinus betulus)
  Pyramid European Hornbeam (Carpinus betulus fastigiata)
  
Hornbeam, Hop (Ostrya virginiana)

Juniper (Juniperus)
  Blue Columnar Juniper (Juniperus chinensis columnaris)
  Keteleer Juniper (Juniperus chinensis keteleeri)
  
Katsura (Cercidiphyllum japonicum)

Lilac (Syringa)
  Common Lilac (Syringa vulgaris)
  Japanese Tree Lilac (Syringa amurensis japonica)
  
Linden (Tilia)
  Crimean Linden (Tilia euchlora)
  Little-leaf Linden (Tilia cordata)
  Silver Linden (Tilia tomentosa)
  
Magnolia (Magnolia)
  Hokkaido Magnolia (Magnolia kobus borealis)
  Saucer Magnolia (Magnolia soulangeana)
      Lennei Magnolia (Magnolia soulangeana lennei)
  Southern Magnolia (Magnolia grandiflora)
  Star Magnolia (Magnolia stellata)
      Pink Star Magnolia (Magnolia stellata rosea)
      Waterlily Magnolia (Magnolia stellata 'Waterlily')
  Sweet-bay Magnolia (Magnolia virginiana)
  
Maple (Acer)
  Black Maple (Acer nigrum)
  Japanese Maple (Acer palmatum)
      Bloodleaf Japanese Maple (Acer palmatum atropurpureum)
  Hedge Maple (Acer campestre)
  Norway Maple (Acer platanoides)
      Crimson King Maple (Acer platanoides 'Crimson King')
      Erect Norway Maple (Acer platanoides erectum)
      Fassens Black Maple (Acer platanoides 'Fassens Black')
      Globe Norway Maple (Acer platanoides globosum)
  Paperbark Maple (Acer griseum)
  Red Maple (Acer rubrum)
  Silver Maple (Acer saccharinum)
      Wiers Weeping Maple (Acer saccharinum laciniatum)
  Sugar Maple (Acer saccharum)  
      Columnar Sugar Maple (Acer saccharum columnare)
  Trident Maple (Acer buergerianum)
  
Mountain-ash (Sorbus)
  European Mountain-ash (Sorbus aucuparia)
  Korean Mountain-ash (Sorbus alnifolia)
  
Oak (Quercus)
  Pin Oak (Quercus palustris)
  Pyramidal English Oak (Quercus robur fastigiata)
  Red Oak (Quercus borealis)
  Sawtooth Oak (Quercus acutissima)
  Scarlet Oak (Quercus coccinea)
  Shingle Oak (Quercus imbricaria)
  White Oak (Quercus alba)
  Willow Oak (Quercus phellos)
  
Pear, Bradford (Pyrus calleryana 'Bradford')

Pepperidge (Nyssa sylvatica)

Pine (Pinus)
  Austrian Pine (Pinus nigra)
  Eastern White Pine (Pinus strobus)
  Japanese Black Pine (Pinus thunbergi)
  Lace-bark Pine (Pinus bungeana)
  Scotch Pine (Pinus sylvestris)
  Silver Japanese White Pine (Pinus parviflora glacua)
  Swiss Stone Pine (Pinus cembra)
  Umbrella Pine (Pinus densifloia umbraculifera)
  
Plane, London (Platanus acerifolia)

Plum, Purpleleaf (Prunus cerasifera pissardi)

Poplar (Populus)
  Carolina Poplar (Populus canadensis eugenei)
  Japanese Poplar (Populus maximowiczi)
  Lombardy Poplar (Populus nigra italica)
  
Redbud (Cercis canadensis)

Red-cedar (Juniperus virginiana)

Russian-olive (Elaeagnus angustifolia)

Schlor-tree, Chinese (Sophora japonica)

Sea-buckthorn (Hippophae rhamnoides)

Shadblow, Allegheny (Amelanchier laevis)

Silk-tree (Albizzia julibrissin)

Silverbell (Halesia)
  Carolina Silverbell (Halesia carolina)
  Mountain Silverbell (Halesia monticola)
  
Smoke-tree (Cotinus americanus)

Snowbell, Japanese (Styrax japonica)

Sorrel-tree (Oxydendrum arboreum)

Spruce (Picea)
  Colorado Spruce (Picea pungens)
      Colorado Blue Spruce (Picea pungens glauca)
  Norway Spruce (Picea abies)
  
Stewartia, Korean (Stewartia koreana)

Sweet Gum (Liquidambar styraciflua)

Tulip-tree (Liriodendron tulipifera)

Umbrella-pine (Sciadopitys verticillata)

Willow (Salix)
  Babylon Weeping Willow (Salix babylonica)
  Contorted Hankow Willow (Salix matsudana tortuosa)
  Golden Weeping Willow (Salix alba tristis)
  Ringleaf Willow (Salix babylonica crispa)
  
Yellow-wood (Cladrastis lutea)

Zelkova (Zelkova serrata)