Dig deeper at SERNEC, a consortium of southeastern herbaria.
You may also want to check Trees, Shrubs, and Woody Vines of North Carolina
Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Rosids: Fabids: Rosales
Flora of North America
Haws: A Guide to Hawthorns of the Southeastern US (Lance, 2014)
Dotted Hawthorn, White Hawthorn