Crataegus ser. Pruinosae
Series "Pruinosae" is a series within the genus "Crataegus" that contains at least six species of hawthorn trees and shrubs, native to Eastern North America. They are similar in some respects to series "Intricatae". They are very thorny, with medium to large leaves, and hard fruit that are usually pinkish in colour. Species. The principal species in the series are: The Grand Rapids hawthorn, "Crataegus" × "coleae", collected in the area of Grand Rapids, Michigan until the 1940s, appears to be a hybrid with series "Anomalae".