Crataegus sp.

Numerous hard-to-distinguish species are found in our area, frequently in old orchards and old fields. Many are native to the state, but not all. All hawthorns have small clusters of white (some pink) flowers in spring followed by small fruits (similar to rose hips or small crab apples), and thorns. Find a good key. Just for fun, look at the introduction to the Crataegus species on Go Botany.