Studies in the vascular flora of the southeastern United States. VII
DOI:
https://doi.org/10.17348/jbrit.v15.i1.1049Resumen
Como parte de los esfuerzos para comprender, documentar y conservar la flora del sureste de América del Norte, proponemos dos nuevas especies, el reconocimiento de una variedad generalmente sinonimizada, la aceptación de dos especies de Waltheria presentes en la península de Florida, la aceptación taxonómica de una especie a veces en desuso se transfiere con un nuevo nombre a un género diferente y se aclara la distribución y ecología de una especie. En Carex (Cyperaceae), re-analizamos los taxones infraspecíficos en Carex intumescens y recomendamos el reconocimiento de dos variedades. Este esquema taxonómico propuesto por primera vez en 1893, pero, no seguido en general en los 128 años posteriores. En Euphorbia (Euphorbiaceae), una evaluación cuidadosa del material del sur de Florida de Euphorbia subg. Chamaesyce sect. Anisophyllum subsect. Hypericifoliae revela la necesidad de cambios taxonómicos para clasificar mejor a los representantes endémicos de este grupo, lo que resulta en el nombramiento de una nueva especie, y la propuesta de un nuevo nombre en el rango de especie en Euphorbia para un taxón nombrado por primera vez en Chamaesyce y tratado posteriormente con solo rango varietal en Euphorbia. Chamaecrista deeringiana (Fabaceae, subfamilia Caesalpinioideae) ha sido repetidamente malinterpretada para incluir dos sistemas de poblaciones diferentes y disjuntos con diferentes morfologías y hábitats, que aquí se interpretan como especies separadas, una recién nombrada y la otra Chamaecrista deeringiana volvió a su interpretación original y más estrecha como un endemismo del sur de Florida. Waltheria (Malvaceae) a veces se ha interpretado como representada en Florida por un solo taxón, Waltheria indica, pero desentrañamos los conceptos de la extendida W. indica y W. bahamensis de las Indias Occidentales. Aclaramos, que ambas están presentes en el sureste de los Estados Unidos. Reconsideramos la ocurrencia y el hábitat de Toxicoscordion nuttallii (Melanthiaceae) en tres estados en los que se ha reportado como especie rara, Mississippi, Missouri y Louisiana, y lo eliminamos de la flora de Mississippi donde se basaba en una cita confusa y errónea. En Luisiana, su ocurrencia en complejos de praderas calcáreas limita su posible ocurrencia en el estado a un hábitat especializado y raro. La exploración cuidadosa de los restos de hábitat puede resultar en el descubrimiento de poblaciones adicionales. Los estudios taxonómicos y las reevaluaciones de este tipo son fundamentales para sentar las mejores bases científicas para las decisiones regulatorias, y políticas de conservación del territorio. Este documento nombra o argumenta a favor de la aceptación renovada de seis especies con preocupación de conservación en todo el rango: una en peligro crítico (G1 – Euphorbia ogdenii), una en peligro (G2 – E. hammeri) y cuatro vulnerables (G3 – E. garberi, E. porteriana, Chamaecrista deeringiana, C. horizontalis).
Citas
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Irwin, H.S. & R.C. Barneby. 1982. The American Cassiinae. Mem. New York Bot. Gard. 35:455–918.
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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.
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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.
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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.
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2021-07-23
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Weakley, A. S., Poindexter, D. B., Medford, H. C., Franck, A. R., Bradley, K. A., Sadle, J., & Kelley, J. M. (2021). Studies in the vascular flora of the southeastern United States. VII. Journal of the Botanical Research Institute of Texas, 15(1), 23–56. https://doi.org/10.17348/jbrit.v15.i1.1049
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