Dig deeper at SERNEC, a consortium of southeastern herbaria.
Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Asterids: Campanulids: Asterales
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Richard and Teresa Ware rtw_m_mohrii_coosa11
It somewhat resembles M. grandiflora, but typically has 2-10 heads per plant, per Weakley's Flora (2012).
Richard and Teresa Ware rtw_marshallia_mohrii
Members of this genus are glandular-dotted perennials w a peduncle over 5cm, per Wildflowers of the Eastern United States.