This flower with fine feathery leaves has just started blooming and was located in a area that stays rather damp. It was growing among Lizard Tail plants, and next to a small mowed grassy area.
this is a delicate native wildflower in the parsley family, Apiaceae, named Ptilimnium capillaceum. It is rather common in South Carolina, especially in the coastal plain, in open wet places. It is very wide-ranging, as this website will show: https://gobotany.newenglandwild.org/species/ptilimnium/capillaceum/
Dr. Steven R. Hill, Botanist SCNPS