Phyiologia (August 1993) 75(2): 159-162. GEOCARPON MINIMUM {CARYOPHYILACEAE), NEW TO LOUISIANA Nelwyn C. Mclnnis The Nature Conservancy, Louisiana Field Office, P.O. Box 4125, Baton Rouge, Louisiana 70821 U.S.A. Latimore M. Smith Louisiana Natural Heritage Program, Department of Wildlife and Fisheries, P.O. Box 98000, Baton Rouge, Louisiana 70898-9000 U.S.A. k Albert B. Pittman South Carolina Heritage Trust, Wildlife & Marine Resources Department, P.O. Box 167, Columbia, South Carolina 29202 U.S.A. ABSTRACT The presence of Geocarpon minimum is documented in Louisiana for the first time. This federally threatened species is found in two saline prairies in Winn Parish, located in north-central Louisiana. The sites are the southernmost known for this species. Associated vascular plant taxa and an ecological description of saline prairies supporting this taxon in Louisiana are provided. KEY WORDS: Louisiana, Geocarpon minimum, Caryophyllaceae, floristics, saline prairie Geocarpon minimum Mackenzie (Caryophyllaceae) is known from south-western Missouri, and northwestern and southern Arkansas, where it is ap-parently restricted to sandstone glades and saline soil prairies, respectively (Pittman 1988, 1992; Tucker 1983). The taxon was listed by the U.S. Fish and Wildlife Service as threatened in July, 1987. Following discovery of a saline prairie in Winn Parish, a survey was conducted at the site in February, 1990, 159
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