The goldenrain tree (Koelreuteria paniculata) makes a great street tree because of its good form and tolerance of heat and drought, pollution, acid or alkaline soils. But it's in midsummer when this attractive tree really shines, its canopy literally covered in dangling yellow flowers. After the flowers come green papery pods, which unfortunately turn unkempt when they age to brown in late summer. Mature height is usually 30 to 40 feet high and wide. USDA Zones 5 to 8.