Acer can be deciduous trees or large shrubs with paired, often palmately-lobed leaves and small flowers followed by characteristic winged fruits. Many have fine autumn colour, and some have ornamental stems.A. pensylvanicum is a snakebark maple forming a medium-sized deciduous tree of upright growth, with white-striped green young branches. Leaves large, 3-lobed, turning yellow in autumn. Flowers yellow in drooping racemes