For Geocarpon
Maguire, B. 1951. Studies in the Caryophyllaceae. -- V. Arenaria in America north of Mexico. Amer. Midl. Nat. 46(2):493-511.
Schilling, E.E., A.J. Floden, A.S. Weakley, C. Winder, and R.L. Small. 2022. Molecular barcoding reveals unexpected diversity in eastern North American Stitchworts (Caryophyllaceae). Bot. J. Linn. Soc.