Acer campestre QUEEN ELIZABETH (syn. ‘Evelyn’) – This cultivar of Hedge Maple has a more vase-shaped growth habit, with 45 degree branch crotch angles. The dark green leaves have 3 to 5 lobes and form a dense canopy, with the fall colour being a beautiful deep yellow. It is a common street tree with a slightly more narrow growth habit. Grows 25-35′ high. Zone 5.
Gleditsia triacanthos f. inermis SKYLINE (syn ‘Skycole’) – A thornless (and nearly seedless) cultivar of Honey Locust with a pyramidal, upright growth habit. It features fine compound foliage with dark green leaflets that shift to bright yellow in the fall. This deciduous tree does allow some filtered light through the crown. Grows 50’+ high by 35’+ wide. Hardy to zone 4.
Fagus sylvatica ‘Dawyck’ (syn. ‘Dawyck Green’, ‘Dawyckii’, ‘Fastigiata’) – This RHS Award of Garden Merit winner is a broadly columnar tree with ascending branches, useful in tight landscapes where a narrow profile is necessary. The simple green foliage often turns a rich golden-yellow in autumn and can persist into winter. Grows 70′ high by 15-20′ wide. Hardy to zone 5.
Acer platanoides ‘Emerald Queen’ – A green-leaved cultivar of Norway Maple which tolerates tougher urban conditions. The 7″ wide leaves have a typical maple form with 5 lobes and shift to a golden-yellow in fall before dropping. It has a dense, rounded crown and bears greenish-yellow spring flowers before the leaves emerge. Grows 60-70′ high by 35-40′ wide. Hardy to zone 3.
Liriodendron tulipifera – The Tulip Tree gets its name from its cup-shaped green with orange base flowers which emerge in early summer. Although this species is capable of reaching a height of 100′ at maturity, it is often smaller in urban settings. The lobed green leaves consistently shift to a clear yellow in autumn. Grows 60-90′ high by 30-50′ wide. Hardy to zone 5.