Dig deeper at SERNEC, a consortium of southeastern herbaria.
Check out EDDMapS.org to see where this has been reported.
Read more about Ragged Robin at Vascular Plants of North Carolina.
Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Caryophyllales
Flora of North America
Silene flos-cuculi ssp. flos-cuculi
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USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913 pnd_lyfl3_001_lvd
Petal limbs deeply divided into 4 linear segments, per Weakley's Flora.