Dig deeper at SERNEC, a consortium of southeastern herbaria.
You may enjoy reading Orchids of the Francis Marion National Forest by Jim Fowler.
Spermatophytes (seed plants): Angiosperms (flowering plants): Monocots: Asparagales
Shadow Witch, Ponthieu's Orchid, Shadow-witch Orchid
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Richard and Teresa Ware rtw_p_racemosasharpen
Flowers borne on long stalks in a well-spaced raceme along the upper stem, per Atlantic Coastal Plain Wildflowers.
Richard and Teresa Ware rtw_ponthieva_racemosa_4
Flowers white with green stripes, positioned horizonatally - "pointing up", per Wild Orchids of South Carolina: A Popular Natural History.