Dig deeper at SERNEC, a consortium of southeastern herbaria.
Read more about Narrowleaf Vervain at Vascular Plants of North Carolina.
Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Asterids: Lamiids: Lamiales
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Richard and Teresa Ware rtw_verbena_simplexa
Flowers occur on one or more blunt-tipped spikes, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians.