|Acer campestre is a slow-growing deciduous tree with dark, oval leaves that turn yellow in the autumn. The 5 lobed leaves are composed of 3 to 5 entire lobes. Blooms in corymbs of 5 green flowers followed by winged fruit. The cultivar, 'William Caldwell' is a small, upright, shrub of dense habit. Leaves are similar to the species in size and shape.