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
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JK Marlow jkm0505u_08
May Williamsburg County SC
Flowers typically open one at a time sequentially up the stem, per Atlantic Coastal Plain Wildflowers.
Jim Fowler jafcop_0003b
May-July Berkeley County SC
Francis Marion National Forest
Lateral sepals are curved toward the stem and petals are curved forward, per Wild Orchids of South Carolina: A Popular Natural History.
Richard and Teresa Ware rtw_c_pallidus_palec
Lateral sepals distinctively reflexed backward w their apices behind flower, per Atlantic Coastal Plain Wildflowers.