Studies in the vascular flora of the southeastern United States. X


  • Alan S. Weakley University of North Carolina
  • Richard J. LeBlond University of North Carolina
  • Patrick D. McMillan
  • Bruce A. Sorrie
  • Derick B. Poindexter University of North Carolina
  • J. Brandon Fuller University of North Carolina
  • Edwin L. Bridges
  • Brett J. Budach
  • Susan C. Carr
  • Andrew A. Crowl Duke University
  • Paul S. Manos Duke University
  • Peter W. Fritsch Botanical Research Institute of Texas
  • Steve L. Orzell Avon Park Air Force Range
  • Joseph K. Wipff
  • Lilly Anderson Messec Florida Native Plant Society
  • Bob Dellinger Francis Marion National Forest
  • Eric A. Ungberg South Carolina Heritage Trust
  • Noah D. Yawn Western Pennsylvania Conservancy
  • Alan M. Cressler
  • Chris Oberholster The Nature Conservancy
  • T. Wayne Barger Alabama Dept. of Conservation and Natural Resources
  • J. Richard Carter Valdosta State University
  • Aaron J. Floden Missouri Botanical Garden
  • Wesley M. Knapp NatureServe
  • Iris Copen Ohio Department of Natural Resources
  • Amy M. Jenkins Florida Natural Areas Inventory
  • Ethan L. Hughes Florida Natural Areas Inventory
  • Jenna Annis Florida Natural Areas Inventory
  • Wilson Baker
  • Randy L. Mears



As part of ongoing work on the Flora of the Southeastern United States (Weakley & Southeastern Flora Team 2023) and related projects, as well as for general floristic, conservation, and scientific work in eastern North America, it is essential to document taxonomic and nomenclatural changes and significant distribution records. Here, we propose six new species of graminoids (two Rhynchospora, three Dichanthelium, and one Anatherum)—five from fire-maintained pine savannas and embedded wetlands of the southeastern Coastal Plain and one from the floristically and ecologically related fire-maintained pine savannas of North Andros Island in The Bahamas. We provide rationale and documentation for the “taxonomic resurrection” of Vaccinium ashei, an economically important member of Vaccinium sect. Cyanococcus, based on morphology, estimation of ploidy level with flow cytometry, and phylogenomic analysis based on high-throughput DNA sequencing. We make four new combinations in Convolvulus to accommodate the inclusion of Calystegia in Convolvulus to resolve paraphyly. We also make six new combinations necessary to recognize sect. Leptopogon of Andropogon at generic rank, as Anatherum, based on the phylogenetic work of other researchers and the previously incomplete transfer of recognized species to Anatherum, providing the needed names to recognize this group of species in genus Anatherum in North American floristic treatments. We document the surprising discovery of Carex lutea, previously believed to be endemic to two counties in eastern North Carolina, in two counties in the panhandle of Florida, and a county in eastern South Carolina—discoveries aided by iNaturalist and Facebook. We document new states as being within the distribution ranges of additional species: Quercus similis (Florida), Juncus brachycephalus (Arkansas and Missouri), Rhexia mariana var. mariana (Ohio), Asarum acuminatum and Elionurus tripsacoides (Alabama), and Mecardonia procumbens (Georgia). Other important distributional records, many representing rediscoveries of conservationally significant, extant populations of plants previously considered of only historical occurrence in a state, are also reported: Alabama (Arnica acaulis, Asclepias connivens, Berberis canadensis, Bulbostylis warei, Ctenodon viscidulus, Parnassia grandifolia, and Pinguicula pumila) and Georgia and Florida (Lobelia boykinii).


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Weakley, A. S., LeBlond, R. J., McMillan, P. D., Sorrie, B. A., Poindexter, D. B., Fuller, J. B., Bridges, E. L., Budach, B. J., Carr, S. C., Crowl, A. A., Manos, P. S., Fritsch, P. W., Orzell, S. L., Wipff, J. K., Messec, L. A., Dellinger, B., Ungberg, E. A., Yawn, N. D., Cressler, A. M., Oberholster, C., Barger, T. W., Carter, J. R., Floden, A. J., Knapp, W. M., Copen, I., Jenkins, A. M., Hughes, E. L., Annis, J., Baker, W., & Mears, R. L. (2024). Studies in the vascular flora of the southeastern United States. X. Journal of the Botanical Research Institute of Texas, 18(1), 17–77.

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