Dig deeper at SERNEC, a consortium of southeastern herbaria.
Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Caryophyllales
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Richard and Teresa Ware rtw_s_regia_royal_catc22b
Petals usually entire, sometimes slightly notched (vs. S virginica notched, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians.
Richard and Teresa Ware rtw_silene_regiaa
Calyx prominently 10-veined, tubular in flower, 18-25 x 3-4mm, per Flora of North America.
Richard and Teresa Ware rtw_silene_regia_12
Inflorescences terminal, cymose, compound, many-flowered, bracteate, per Flora of North America.