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: Asterids: Lamiids: Lamiales
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John Ruter, University of Georgia, Bugwood.org bug_1580141
Flowers purple without an orange center.Leaves dark green, upper side shiny, per Invasive Plants, Guide to Identification, Impacts and Control.