Dig deeper at SERNEC, a consortium of southeastern herbaria.
Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Rosids: Malvids: Myrtales
Manual of the Southeastern Flora (Small, 1933)
Stemless Evening Primrose
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Richard and Teresa Ware rtw_oenothera_triloba_31
No aboveground stem, with leaves & flowers arising from a stout rootstock, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians.