The taxonomy and identification of hawthorns (Crataegus) in eastern North America is one of the most notorious challenges in regional botany. This book was written to fill a long-standing void in hawthorn understanding for the southeastern U.S., designed for both nature enthusiast and academic student. All significant species and their variations known to occur in the area are presented, using copious photographs, identification keys, range maps, natural histories and reference tables. The 206 pertinent taxa described include a synonomy of over 390 additional names.