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
Manual of the Southeastern Flora (Small, 1933)
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Joseph M. DiTomaso, University of California - Davis, Bugwood.org bug_5387436
Spikes more slender than Peppermint's and with a distinctive Spearmint aroma, per Wildflowers of the Southern Mountains.
Joseph M. DiTomaso, University of California - Davis, Bugwood.org bug_5387436b
Petioles of the main leaves 0-3 mm long (vs. 4-15 mm long in M. xpiperita), per Weakley's Flora.