Studies in the vascular flora of the southeastern United States. VII
As part of ongoing efforts to understand, document, and conserve the flora of southeastern North America, we propose two new species, the recognition of a usually synonymized variety, the acceptance of two species of Waltheria as being present in peninsular Florida, taxonomic acceptance of a sometimes deprecated species transferred with a new name into a different genus, and we clarify the distribution and ecology of a species. In Carex (Cyperaceae), we re-analyze infrataxa in Carex intumescens and recommend the recognition of two varieties, a taxonomic schema first proposed in 1893, but usually not followed in the 128 years since. In Euphorbia (Euphorbiaceae), a careful assessment of south Florida material of Euphorbia subg. Chamaesyce sect. Anisophyllum subsect. Hypericifoliae reveals the need for taxonomic changes to best classify endemic representatives of this group, resulting in the naming of a new species, and a new name at species rank in Euphorbia for a taxon first named in Chamaesyce and sometimes subsequently treated at only varietal rank in Euphorbia. Chamaecrista deeringiana (Fabaceae, subfamily Caesalpinioideae) has been repeatedly misinterpreted to include two different and disjunct population systems with differing morphologies and habitats, which are here interpreted as separate species, one newly named and the other Chamaecrista deeringiana returned to its original and narrower interpretation as a south Florida endemic. Waltheria (Malvaceae) has sometimes been interpreted as being represented in Florida by a single taxon, Waltheria indica, but we disentangle the concepts of the widespread W. indica and the West Indian W. bahamensis and clarify that both are present in the southeastern United States. We reconsider the occurrence and habitat of Toxicoscordion nuttallii (Melanthiaceae) in three states in which it has been reported as a rare species, Mississippi, Missouri, and Louisiana, and remove it from the Mississippi flora as a garbled and false report. In Louisiana, its occurrence in calcareous prairie complexes limits its potential occurrence in the state to a specialized and rare habitat, but careful exploration of habitat remnants may result in the discovery of additional populations. Taxonomic studies and re-assessments of this kind are critical in laying the best scientific foundation for regulatory, policy, and land conservation decisions. This paper names or makes the case for the renewed acceptance of six species with range-wide conservation concern: one Critically Imperiled (G1 – Euphorbia ogdenii), one Imperiled (G2 – E. hammeri), and four Vulnerable (G3 – E. garberi, E. porteriana, Chamaecrista deeringiana, C. horizontalis).
Bailey, L.H. 1893. Notes on Carex – XVII. Bull. Torrey Bot. Club 20:417–429.
Ball, P.W., & A.A. Reznicek. 1993. Carex. In: Flora of North America Editorial Committee, eds. Flora of North America north of Mexico. Oxford University Press, New York, New York, U.S.A., and Oxford, U.K. 23:274–572.
Barneby, R.C. 1977. Daleae imagines, an illustrated revision of Errazurizia Philippi, Psorothamnus Rydb., Marina Liebmann, and Dalea Lucanus emend. Barneby, including all species of Leguminosae tribe Amorpheae Borissova ever referred to Dalea. Mem. New York Bot. Gard. 27:1–892.
Berry, P.E., R. Riina, J.A. Peirson, Y. Yang, V.W. Steinmann, D.V. Geltman, J.J. Moraw etz, & N.I. Cacho. 2016. Euphorbia. In: Flora of North America Editorial Committee. 2016. Flora of North America north of Mexico. Volume 12, Magnoliophyta:Vitaceae to Garryaceae. Oxford Univ. Press, New York, New York, U.S.A.
Bickford, D., D. J.Lohman, N.S. Sodhi, P.K. Ng, R. Meier, K. Winkler, & I. Das. 2007. Cryptic species as a window on diversity and conservation. Trends Ecol. Evol. 22:148–155.
Bouckaert, R., T.G. Vaughan, J. Barido-Sottani, S. Duchêne, M. Fourment, A. Gavryushkina, et al. 2019. BEAST 2.5: An advanced software platform for Bayesian evolutionary analysis. PLoS computational biology 15(4):e1006650.
Britton, N.L. 1903. A new Waltheria from the Bahamas. Torreya 3:105–106.
Britton, N.L. & C.F. Millspaugh. 1920. The Bahama flora. New York Botanical Garden, Bronx, New York, U.S.A.
Britton, N.L. & J.N. Rose. 1930. Family 23. Caesalpiniaceae. North American Flora 23:201–349.
Burch, D.G. 1965. A taxonomic revision of the genus Chamaesyce (Euphorbiaceae) in the Caribbean. Ph.D. dissertation, University of Florida, Gainesville, Florida, U.S.A.
Burch, D.G. 1966. Two new species of Chamaesyce (Euphorbiaceae), new combinations, and a key to the Caribbean members of the genus. Ann. Missouri Bot. Gard. 53:90–99.
Chafin, L.G. 2007. Field guide to the rare plants of Georgia. State Botanical Garden of Georgia, Athens, Georgia, U.S.A.
Chalker-Scott, L. 1999. Environmental significance of anthocyanins in plant stress responses. Photochem. & Photobiol. 70:1–9.
Chapman, A.W. 1860. Flora of the Southern United States. Ivison, Phinney, & Co., New York, New York, U.S.A.
Chapman, A.W. 1878. An enumeration of some plants—chiefly from the semi-tropical regions of Florida—which are either new, or which have not hitherto been recorded as belonging to the flora of the southern states. Bot. Gaz. 3:2–6, 9–12, 17–21.
Correll, D.S. & H.B. Correll. 1982. Flora of the Bahama archipelago. A.R. Gantner Verlag KG, Vaduz, Liechtenstein.
Cronquist, A. 1949. Noteworthy plants of Georgia. Castanea 14:101–108.
Doyle, J.J. & J.L. Doyle. 1987. A rapid DNA isolation procedure for small quantities of fresh leaf tissue. Phytochem. Bull. 19:11–15.
EPA (U.S. Environmental Protection Agency). 2003. Level III Ecoregions of the Continental United States. National Health and Environmental Effects Research Laboratory, EPA.
ESRI. 2017. ArcGIS. Version 10.5. Environmental Systems Research Institute, Redlands, California, U.S.A.
Fernald, M.L. 1942. Critical notes on Carex. Rhodora 44:281–331, 333–334.
Fernald, M.L. 1950. Gray’s manual of botany, eighth (centennial) edition. Corrected printing, 1970. D. Van Nostrand Co., New York, New York, U.S.A.
Freid, E., J. Francisco-Ortega, & B. Jestrow. 2014. Endemic seed plants in the Bahamian archipelago. Bot. Rev. (Lancaster) 80:204–230.
Gillis, W.T. 1974. Name changes for the seed plants in the Bahama flora. Rhodora 76:67–138.
Gleason, H.A. 1952. The new Britton and Brown illustrated flora of the northeastern United States and adjacent Canada. New York Botanical Garden and Hafner Press, Bronx, New York, U.S.A.
Gleason, H.A. & A. Cronquist. 1991. Manual of vascular plants of northeastern United States and adjacent Canada, second edition. New York Botanical Garden, Bronx, New York, U.S.A.
Godfrey, R.K. & J.W. Wooten. 1979. Aquatic and wetland plants of southeastern United States, monocotyledons. University of Georgia Press, Athens, Georgia, U.S.A.
Haines, A.A. 2011. New England Wildflower Society’s Flora Novae Angliae, a manual for the identification of native and naturalized higher vascular plants of New England. New England Wildflower Society and Yale Univ. Press, New Haven, Connecticut, U.S.A.
Herndon, A. 1993. Notes on Chamaesyce (Euphorbiaceae) in Florida. Rhodora 95:352–68.
Irwin, H.S. & R.C. Barneby. 1982. The American Cassiinae. Mem. New York Bot. Gard. 35:455–918.
Isley, D. 1975. Leguminosae in the United States: II. Subfamily Caesalpinioideae. Mem. New York Bot. Gard. 25:1–228.
Isely, D. 1986. Notes on Leguminosae: Papilionoideae of the Southeastern United States. Brittonia 38:352–359.
Isely, D. 1998. Native and naturalized Leguminosae (Fabaceae) of the United States (exclusive of Alaska and Hawaii). Monte L. Bean Life Science Museum, Brigham Young University, Provo, Utah, U.S.A.
Kartesz, J.T. 2015. North American plant atlas. (http://bonap.net/napa). Floristic Synthesis of North America, Version 1.0. Biota of North America Program (BONAP), Chapel Hill, North Carolina, U.S.A.
Keener, B.R., A.R. Diamond, L.J. Davenport, P.G. Davison, S.L. Ginzbarg, C.J. Hansen, C.S. Maj or, D.D. Spaulding, J.K. Triplett, & M.
Woods. 2021. Alabama Plant Atlas. [S.M. Landry and K.N. Campbell (original application development), Florida Center for Community Design and Research. University of South Florida]. University of West Alabama, Livingston, Alabama, U.S.A.
Ladd , D. & J.R. Thomas. 2015. Ecological checklist of the Missouri flora for Floristic Quality Assessment. Phytoneuron 2015–12:1–274.
Ledin, R.B. 1953. John Loomis Blodgett (1809–1853). Tequesta 13:23–33.
Mackenzie, K.K. 1931–1935. Poales, Cyperaceae, Cypereae (pars). North American flora 18(1–7):1–478.
McCune, B. & M.J. Mefford. 2011. PC–ORD. Multivariate analysis of ecological data. Version 6. MjM Software, Gleneden Beach, Oregon, U.S.A.
McMahon, M. & L. Hufford. 2004. Phylogeny of Amorpheae (Fabaceae: Papiliodoideae). Amer. J. Bot. 91:1219–1230.
NatureServe. 2020. NatureServe Explorer: An online encyclopedia of life [web application]. Version 7.1. NatureServe,
Arlington, Virginia, U.S.A. Available http://explorer.natureserve.org. (Accessed: December 8, 2020)
Northrop, A.R. 1902. Flora of New Providence and Andros. Mem. Torrey Bot. Club 12:1–94.
Pennell, F.W. 1917. The genus Chamaecrista Moench in the United States. Bull. Torrey Bot. Club 44:339–362.
Pullen, T.M. 1963. The Cassia fasciculata complex (Leguminosae) in the United States. Ph.D. dissertation, University of Georgia, Athens, Georgia, U.S.A.
Radford, A.E., H.E. Ahles, & C.R. Bell. 1968. Manual of the vascular flora of the Carolinas. University of North Carolina Press, Chapel Hill, North Carolina, U.S.A.
Reznicek, A.A. 1993. Carex sect. Lupulinae. In: Flora of North America Editorial Committee, eds. Flora of North America north of Mexico. Oxford University Press, New York, U.S.A., and Oxford, U.K. 23:511–514.
Reznicek, A.A. & P.W. Ball. 1974. The taxonomy of Carex series Lupulinae in Canada. Canad. J. Bot. 52:2387–2399.
Rhoads, A.F. & T.A. Block. 2007. The plants of Pennsylvania: An illustrated manual. Second edition. Univ. of Pennsylvania Press, Philadelphia, Pennsylvania, U.S.A.
Robinson, B.L. & M.L. Fernald. 1908. Gray’s new manual of botany, a handbook of the flowering plants and ferns of the central and northeastern United States and adjacent Canada. 7th edition, illustrated. American Book Company, New York, New York, U.S.A.
Rose, J.N. 1899. Synopsis of the North American species of Waltheria. Contr. U.S. Natl. Herb. 5:183–185.
Saunders, J.G. 1995. Systematics and evolution of Waltheria (Sterculiaceae-Hermannieae). Ph.D. dissertation, University of Texas at Austin, Austin, Texas, U.S.A.
Saunders, J.G. 2011. Resurrection of the Maui endemic Waltheria pyrolifolia (Sterculiaceae, Hermannieae). Darwiniana 49:76–85.
Saunders, J.G. 2015. Waltheria. In: Flora of North America Editorial Committee, eds. Flora of North America north of Mexico. Oxford University Press, New York, New York, U.S.A., and Oxford, U.K. 6:212–215.
Schafale, M.P. 2012. Guide to the natural communities of North Carolina, 4th approximation. North Carolina Natural Heritage Program, Department of Environment and Natural Resources, Raleigh, North Carolina, U.S.A.
Schwartz, F.C. 2003. Zigadenus. In: Flora of North America Editorial Committee, eds. Flora of North America north of Mexico. Oxford Univ. Press, New York, New York, U.S.A., and Oxford, U.K. 26:81–88.
Small, J.K. 1903. Flora of the southeastern United States: Being descriptions of the seed-plants, ferns and fern-allies growing naturally in North Carolina, South Carolina, Georgia, Florida, Tennessee, Alabama, Mississippi, Arkansas, Louisiana and the Indian territory and in Oklahoma and Texas east of the one-hundredth meridian. Published by the author, New York, New York, U.S.A.
Small, J.K. 1913. Flora of the Florida Keys: Being descriptions of the seed-plants growing naturally on the islands of the Florida Reef from Virginia Key to Dry Tortugas. Published by the author, New York, U.S.A.
Small, J.K. 1919. Chamaecrista deeringiana. Addisonia 4:1–2, pl. 121.
Small, J.K. 1933. Manual of the southeastern flora: being descriptions of the seed plants growing naturally in Florida, Alabama, Mississippi, eastern Louisiana, Tennessee, North Carolina, South Carolina and Georgia. University of North Carolina Press, Chapel Hill, North Carolina, U.S.A.
Sorrie, B.A. & S.W. Leonard. 1999. Noteworthy records of Mississippi vascular plants. Sida 18:889–908.
Sorrie, B.A. & A.S. Weakley. 2001. Coastal Plain vascular plant endemics: phytogeographic patterns. Castanea 66:50–82.
Tennessee Flora Committee. 2015. Guide to the vascular plants of Tennessee. Editors: E.W. Chester, B.E. Wofford, J. Shaw, D.
Estes, and D.H. Webb. University of Tennessee, Knoxville, Tennessee, U.S.A.
Uttal, L.J. 1971. A defense of Carex intumescens var. fernaldii. Rhodora 73:51–52.
Voss, E.G. & A.A. Reznicek. 2012. Field manual of Michigan flora. University of Michigan Press, Ann Arbor, Michigan, U.S.A.
Ward, D.B. 2009. The typification of Crotalaria rotundifolia and Crotalaria maritima (Fabaceae). J. Bot. Res. Inst. Texas 3:219–225.
Weakley, A.S. 2020. Flora of the southeastern United States. University of North Carolina Herbarium, North Carolina Botanical Garden, Chapel Hill, North Carolina, U.S.A.
Weakley A.S., J.C. Ludwig, & J.F. Townsend. 2012. Flora of Virginia. Bland Crowder, ed. Foundation of the Flora of Virginia Project Inc., Richmond, Virginia & Botanical Research Institute of Texas Press, Fort Worth, Texas, U.S.A.
Weakley, A.S., J.C. Ludwig, J.F. Townsend, & G.P. Fleming. 2020a. Flora of Virginia App. With significant additions and updates. Bland Crowder, ed. Foundation of the Flora of Virginia Project Inc., Richmond, Virginia, U.S.A., and High Country Apps, Bozeman, Montana, U.S.A.
Weakley, A.S., R.J. LeBlond, B.A. Sorrie, C.T. Witsell, L.D. Estes, K.G. Mathews, A. Ebihara, & K. Gandhi. 2011. New combinations, rank changes, and nomenclatural and taxonomic comments in the vascular flora of the southeastern United States. J. Bot. Res. Inst. Texas 5:437–455.
Weakley, A.S., D.B. Poindexter, R.J. LeBlond, B.A. Sorrie, C.H. Karlsson, P.J. Williams, E.L. Bridges, S.L. Orzell, B.R. Keener, A. Weeks, R.D. Noyes, M. Flores-Cruz, J.T. Diggs, G.D. Gann, & A.J. Floden. 2017. New combinations, rank changes, and nomenclatural and taxonomic comments in the vascular flora of the southeastern United States. II. J. Bot. Res. Inst. Texas
Weakley, A.S., D.B. Poindexter, R.J. LeBlond, B.A. Sorrie, E.L. Bridges, S.L. Orzell, A.R. Franck, M. Schori, B.R. Keener, A.R. Diamond, Jr., A.J. Floden, & R.D. Noyes. 2018a. New combinations, rank changes, and nomenclatural and taxonomic comments in the vascular flora of the southeastern United States. III. J. Bot. Res. Inst. Texas 12:27–67.
Weakley, A.S., B.A. Sorrie, R.J. LeBlond, D.B. Poindexter, A.J. Floden, E.E. Schilling, A.R. Franck, & J.C. Kees. 2018b. New combinations, rank changes, and nomenclatural and taxonomic comments in the vascular flora of the southeastern United States. IV. J. Bot. Res. Inst. Texas 12:461–480.
Weakley, A.S., R.K.S. McClelland, R.J. LeBlond, K.A. Bradley, J.F. Matthews, C. Anderson, & A.R. Franck. 2019. Studies in the vascular flora of the southeastern United States: V. J. Bot. Res. Inst. Texas 13:107–129.
Weakley, A.S., D.B. Poindexter, H.C. Medford, B.A. Sorrie, C.A. McCormick, E.L. Bridges, S.L. Orzell, K.A. Bradley, H.E. Ballard, Jr., R.N. Burwell, S.L. Lockhart, & A.R. Franck. 2020b. Studies in the vascular flora of the southeastern United States. VI. J. Bot. Res. Inst. Texas 14:199–239.
Wemple, D.K. 1965. Revision of the genus Petalostemon (Leguminosae). Ph.D. thesis. Iowa State University, Ames, Iowa, U.S.A.
Whetstone, R.D. 1983. The Sterculiaceae in the flora of the southeastern United States. Sida 10:15–23.
Wunderlin, R.P. & B.F. Hansen. 2011. Guide to the vascular plants of Florida, third edition. University Press of Florida, Gainesville, Florida, U.S.A.
Wunderlin, R.P., B.F. Hansen, A.R. Franck, & F.B. Essig. 2021. Atlas of Florida Plants (http://florida.plantatlas.usf.edu/).
Yang, Y. & P.E. Berry. 2011. Phylogenetics of the Chamaesyce clade (Euphorbia, Euphorbiaceae): reticulate evolution and long-distance dispersal in a prominent C4 lineage. Amer. J. of Bot. 98:1486–1503.
Yang, Y., R. Riina, J.J. Morawetz, T. Haevermans, X. Aubriot, & P.E. Berry. 2012. Molecular phylogenetics and classification of Euphorbia subgenus Chamaesyce (Euphorbiaceae). Taxon 61:764–789.
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