Parsley-leaf hawthorn is like most other hawthorns in that it's a small deciduous tree or shrub with dainty white flowers that appear in spring before the foliage. The leaves are distinctively dissected, like that of parsley. The leaves often emerge in clumps from little "short shoots" or spurs that occur along the branches. The individuals I found had small thorns, although I they can occur thornless. The flowers lead to small fruits similar in appearance to rose hips.