Dig deeper at SERNEC, a consortium of southeastern herbaria.
Check out EDDMapS.org to see where this has been reported.
Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Rosids: Fabids: Rosales
Britton & Brown Illus Flora of Northeast US & adjacent Canada (Gleason, 1952)
Glossy Buckthorn, European Alder-buckthorn