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: Malvids: Myrtales
Manual of the Southeastern Flora (Small, 1933)
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Richard and Teresa Ware rtw_cuphea_carthagenens_b
Leaves opposite (none whorled); petioles to 8 mm long, often very short, per Weakley's Flora.
Richard and Teresa Ware rtw_cuphea_carthagenens_c
Floral tube green, glabrous inside; stamens much shorter than floral tube, per Weakley's Flora.