SHADE TREE COMMISSION

SMALL TREES – (UNDER 30′)

• Acer buergerianum – Trident maple*
  
• Acer ginnala – Amur maple
  
• Acer campestre ‘Queen Elizabeth’ – Queen Elizabeth hedge maple
  
• Acer tataricum – Tatarian maple*
  
• Amelanchier x grandiflora – Serviceberry* (many cultivars)
  
• Cercis canadensis  `Oklahoma’*- Oklahoma redbud (only cultivar drought resistant enough to qualify; specify street tree form)
  
• Crataegus crus-galli ‘Inermis’ – Thornless cockspur hawthorn
  
• Crataegus lavallei – Lavalle hawthorn
  
• Crataegus phaenopyrum `Princeton Sentry’ or `Ohio King’ – Washington hawthorn*
  
• Crataegus viridis ‘Winter King’ – Green hawthorn*
  
• Magnolia stellata – Star magnolia*
  
• Malus cultivars – crabapple* (disease resistance emphasized; specify street tree form) `Adams’, `Centurion’, `Donald Wyman’, `Indian Magic’, `Prairie Fire’, `Professor
  Sprenger’, `Red Jewel’, `Sentinel’, `Spring Snow’, `Sugar Tyme’, `Strawberry Parfait’
  
• Malus floribunda – Japanese flowering crabapple
  
• Malus sieboldii x zumi ‘Calocarpa’ – Zumi crabapple
  
• Malus zumi – ‘Glen Mills’ – Glen Mills crabapple
  
• Prunus ‘Accolade’ or `Okame’ – Flowering cherry
  
• Prunus sargentii ‘Columnar’ – Sargent cherry
  
• Prunus serrulata ‘Amanogawa’, ‘Kwanzan’ – Japanese flowering cherry*
  
• Prunus virginiana ‘Shubert’- Shubert Chokecherry
  
• Syringa reticulata ‘Summer Snow’ or ‘Regent’ (better form than `Ivory Snow’) – Tree lilac*

*Duquesne Light Approved List Of Utility-Compatible Trees for Planting in Distribution and Sub-Transmission Corridors (Maximum Mature Height <25 Feet)

MEDIUM TREES – (30′ to 45′)

• Acer campestre – Hedge maple
  
• Acer griseum – Paperbark maple
  
• Aesculus x carnea ‘Briotii’ – Ruby red chestnut (specify street tree form)
  
• Carpinus betulus ‘Fastigiata’ – Upright European hornbeam
  
• Carpinus caroliniana – American hornbeam
  
• Halesia carolina  – Carolina silverbell
  
• Koelreuteria paniculata – Golden rain tree
  
• Maackia amurense  – Amur maackia
  
• Parrotia persica – Persian parrotia
  
• Phellodendron amurens ‘Macho’ – Amur cork tree (male seedless trees only)
  
• Prunus yedoensis – Yoshino cherry
  
• Quercus acutissima – Sawtooth oak
  
• Sorbus alnifolia – Korean mountain ash
  
• Sorbus aucuparia ‘Fastigiata’ – Upright mountain ash

LARGE TREES – (OVER 45′)

• Acer freemanii – Autumn blaze maple
  
• Acer  rubrum  – Red maple (own rooted plants best – many cultivars; ‘Autumn Flame’ and `Red Sunset’ may have better branching structure than ‘October Glory’ or ‘Armstrong’)
  Celtis laevigata ‘All Seasons’ – Sugar hackberry
  
• Celtis occidentalis ‘Prairie Pride’ or ‘Magnifica’ – Hackberry
  
• Corylus colurna – Turkish filbert
  Eucommia ulmoides – Hardy rubber tree
  
• Ginkgo biloba – Ginkgo (male selections like `Magyar’ only)
  
• Gleditsia triacanthos ‘Shademaster’ or other cultivars – Honeylocust
  
• Gymnocladus dioicus  – Kentucky coffee tree (male seedless selections like `Macho’)
  
• Liquidambar styraciflua  – Sweet gum (`Rotundiloba’ is seedless)
  
• Metasequoia glyptostroboides – Dawn redwood (specify street tree form)
  
• Nyssa sylvatica – Black gum
  
• Platanus x acerifolia – London plane tree
  
• Quercus alba – White oak
  
• Quercus bicolor – Swamp white oak
  
• Quercus imbricaria – Shingle oak
  
• Quercus palustris ‘Green Pillar’ – Upright Pin Oak Bacterial leaf scorch caution
  
• Quercus phellos – Willow oak
  
• Quercus robur – English oak
  
• Quercus rubra – Red oak Bacterial leaf scorch caution
  
• Quercus shumardii – Shumard oak Bacterial leaf scorch caution
  
• Sophora japonica – Japanese scholar tree (cultivars ‘Halka’ or `Regent’)
  
• Taxodium distichum – Bald cypress (specify street tree form)
  
• Tilia americana Wandell’ – Legend American linden
  
• Tilia americana `Redmond’ – Redmond linden
  
• Tilia cordata – Little leaf linden cultivars
  
• Tilia euchiora – Crimean linden (ungrafted specimens)
  
• Tilia tomentosa – Silver linden
  
• Ulmus americana ‘Delaware’, ‘Valley Forge’ or `New Harmony’ — Dutch Elm Disease (DED) resistant elms Elm yellows caution
  
• Ulmus `Homestead’ or `Accolade’ -hybrid DED resistant elm cultivars Elm yellows caution
  
• Ulmus parvifolia ‘Dynasty’ or ‘Athens’ – Lacebark elm Elm yellows caution
  
• Zelkova serrata ‘Village Green’, ‘Mushashino’, or ‘Halka’ — Zelkova (avoid ‘Green Vase’)

REFERENCES:

Jason Lubar – Morris Arboretum
Al Sam – State College Borough Urban Forester
Vincent Cotrone – PSU Extension Urban Forester
Julianne Scheiffer – PSU Extension Urban Forester
Michael A. Dirr - Manual of Woody Landscaper Plants

Cornell University - Recommended Urban Trees: Tree Selection for Stress Tolerance Street Municipal Tree Restoration Program and the Directory of Landscape Tree Cultivars - Tree Factsheets
Cornell University - Creating the Urban Forest: The Bare Root Method –

Recommended reference: Gerhold, Henry, Wandell, Willet, and Lacasse, Norman. 3rd ed. 2001. Landscape Tree Factsheets. The Pennsylvania State University, University Park, State College, PA.