Geocarpon minimum (Caryophyllaceae), new to Oklahoma, U.S.A.


  • Amy K. Buthod Oklahoma Biological Survey
  • Lisa Miller



The federally threatened species Geocarpon minimum is documented for the flora of Oklahoma for the first time. Approximately 500 individuals were found at four sandstone glade sites near Skiatook Lake in Osage County, Oklahoma. This manuscript describes G. minimum habitat and distribution in Oklahoma and throughout the rest of its range.


AMYBUTHOD. 2023. iNaturalist observation. Available Accessed 26 Apr 2023.

BAKER, B. 2016. Geocarpon minimum (Geocarpon): 5-year review: summary and evaluation. U.S. Fish and Wildlife Service Southeast Region, Arkansas Ecological Services Field Office, Conway, AR, U.S.A.

DIAMOND, D.D. & L.F. ELLIOTT. 2015. Oklahoma ecological systems mapping interpretive booklet: Methods, short type descriptions, and summary results. Oklahoma Department of Wildlife Conservation, Norman, OK, U.S.A.

EDWARDS, C., M. ALBRECHT, & G. YATSKIEVYCH. 2017. Rangewide conservation genetics of Geocarpon. Missouri Botanical Garden, St. Louis, MO, U.S.A.

KEITH, E.L, J.R. SINGHURST, & S. COOK. 2004. Geocarpon minimum (Caryophyllaceae), new to Texas. Sida 21(2):1165–2004.

LLM3629. 2023. iNaturalist observation. Available Accessed 26 Apr 2023.

MACKENZIE, K.K. 1914. A new genus from Missouri. Torreya 14:67–68.

MCINNIS, N.C., L.M. SMITH, & A.B. PITTMAN. 1993. Geocarpon minimum (Caryophyllaceae), new to Louisiana. Phytologia 75:159–162.

MISSOURI DEPARTMENT OF CONSERVATION. 2023. Field guide: Endangered. Available Accessed 31 July 2023.

NATURESERVE. 2023. NatureServe Explorer: An online encyclopedia of life [web application]. Version 4.0 NatureServe, Arlington, Virginia. Available Accessed 27 Apr 2023.

OKLAHOMA NATURAL HERITAGE INVENTORY. 2015. Heritage database. Available Accessed 27 Apr 2023.

ORZELL, S.L. & E.L. BRIDGES. 1987. Further additions and noteworthy collections in the flora of Arkansas, with historical, ecological, and phytogeographical notes. Phytologia 64:81–144.

PALMER, E.J. & J. STEYERMARK. 1950. Notes on Geocarpon minimum Mackenzie. Bull. Torrey Bot. Club 77:266–273.

RETTIG, J.H. 1983. A new Arkansas station for Geocarpon minimum Mackenzie (Caryophyllaceae). Bull. Torrey Bot. Club 110:213.

SMITH, T.E. & J.S. ELY 2006. A demographic and ecological analysis of Geocarpon minimum (Caryophyllaceae): A federally threatened species in southwest Missouri. Sida 22(2):1145–1157.

SOIL SURVEY STAFF, Natural Resources Conservation Service, United States Department of Agriculture. 2023. Web soil survey. Available Accessed 1 May 2023.

STEYERMARK, J. 1963. Flora of Missouri. Iowa State Press, Ames, IA, U.S.A.

STEYERMARK, J., J.W. VOIGHT, & R.H. MOHLENBROCK. 1959. Present biological status of Geocarpon minimum Mackenzie. Bull. Torrey Bot. Club. 86:228–235.

TEXAS PARKS AND WILDLIFE. 2023. Federal and State Listed Plants of Texas. Available Accessed 21 Jul 2023.

U.S. FISH AND WILDLIFE SERVICE. 1987. Endangered and threatened wildlife and plants: Threatened status for Geocarpon minimum. Fed. Reg. 52:22930–22933.




How to Cite

Buthod, A. K., & Miller, L. (2023). Geocarpon minimum (Caryophyllaceae), new to Oklahoma, U.S.A. Journal of the Botanical Research Institute of Texas, 17(2), 535–539.