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El Género Mitreola (Loganiaceae) En México

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El Género Mitreola (Loganiaceae) En México Artículo de investigación El género Mitreola (Loganiaceae) en México The genus Mitreola (Loganiaceae) in Mexico C. Sofia Islas-Hernández1 , Helga Ochoterena Booth2 , Susana Valencia-Ávalos3 , Leonardo O. Alvarado-Cárdenas1, 4 Resumen: Antecedentes y Objetivos: Loganiaceae es un grupo de plantas tropicales que se han estudiado escasamente en México. Algunos de sus taxones son poco conocidos en cuanto a su taxonomía y distribución, como el caso del género Mitreola, en el que además algunas de sus especies tienen problemas nomenclaturales. Este trabajo presenta una revisión taxonómica de Mitreola petiolata y resuelve los problemas nomenclaturales que ha tenido a lo largo de los años. Métodos: Se revisaron especímenes en diferentes herbarios, literatura especializada para la obtención de descripciones y claves taxonómicas, nú- mero de especies del género y su distribución; así como la circunscripción y problemas nomenclaturales del taxon. Para la obtención de los datos palinológicos, se acetolizó material de flores maduras y se revisó en el microscopio electrónico de barrido. A partir de los datos obtenidos se obtuvo una evaluación de la situación de conservación. Resultados clave: Mitreola petiolata tiene una distribución pantropical y es la única especie del género presente en el país. La especie se extiende desde Tamaulipas y Sinaloa hasta la Península de Yucatán. A pesar de la variación morfológica de estructuras como las hojas o los lóbulos de la cáp- sula, los caracteres de importancia taxonómica (inflorescencias dicotómicas, flores subsésiles y estambres insertos cerca de la base de la corola) se mantienen constantes. Se proporciona una revisión paraM. petiolata, una clave dicotómica, datos sobre su distribución y estado de conservación en el país. Se presenta información detallada sobre la micromorfología de los granos de polen, la primera hecha para la especie. Se sugiere la categoría de preocupación menor por su amplia distribución. Conclusiones: La constante revisión y curación de las colecciones biológicas mantiene actualizado el conocimiento de los taxones. Tal es el caso deM. petiolata, para la cual se proporciona una actualización de su sistemática, distribución y estado de conservación. Palabras clave: historia taxonómica, Mitreola petiolata, polen. Abstract: Background and Aims: Loganiaceae is a group of tropical plants, which have been poorly studied in Mexico. Some of the taxa are little known in terms of their taxonomy and distribution, such as the genus Mitreola, where additionally some of the species have nomenclatural problems. This work fo- cuses on a taxonomic review of Mitreola petiolata and solves the nomenclatural problems that the species has had over the years. Methods: A review of specimens in different herbaria was carried out, specialized literature to obtain descriptions and taxonomic keys, the number of species of the genus and their distribution, as well as the circumscription and nomenclatural problems of the taxon. To obtain the palynological data, material from mature flowers was acetylated and revised with the scanning electron microscope. From these data an evaluation of the conservation situation was obtained. Key results: Mitreola petiolata has a pantropical distribution and is the only species of the genus present in the country, growing from Tamaulipas and Sinaloa to the Yucatán Peninsula. In spite of the morphological variation of structures such as the leaves or the lobes of the capsule, the characters of taxonomic importance (dichotomic inflorescence, subsessile flowers and stamens inserted close to the base of the corolla) remain constant. A review for M. petiolata, a dichotomous key, data on its distribution and conservation status in the country is provided. Detailed information on the micromorphology of pollen grains is presented, the first made for the species. The category of Least Concern is suggested, due to its wide distribution. Conclusions: The constant revision and curation of biological collections, keeps knowledge of taxa updated. This is the case ofMitreola petiolata, for which an update of its systematics, distribution and state of conservation is provided. Key words: Mitreola petiolata, pollen, taxonomic history. 1 Universidad Nacional Autónoma de México, Facultad Recibido: 9 de mayo de 2018. Citar como: de Ciencias, DepartamentoArtículo de Biología Comparada, Revisado: 18 de junio de 2018. aceptadoIslas-Hernández, C. S., H. Ochoterena Booth, S. Valen- Laboratorio de Plantas Vasculares, Apdo. postal 70- Aceptado por Marie-Stéphanie Samain: 21 de agosto cia-Ávalos y L. O. Alvarado-Cárdenas. 2018(2019). Mi- 282, 04510 Cd. Mx., México. de 2018. treola (Loganiaceae) para México. Acta Botanica Mexi- 2 Universidad Nacional Autónoma de México, Instituto Publicado Primero en línea: 10 de diciembre de 2018. cana 126: e1388. DOI: 10.21829/abm126.2019.1388 de Biología, Departamento de Botánica, Apdo. postal Publicado: Acta Botanica Mexicana 126 (2019). 70-367, 04510 Cd. Mx., México. 3 Universidad Nacional Autónoma de México, Facultad de Ciencias, Herbario Nacional (FCME), Apdo. postal 70-282, 04510 Cd. Mx., México. Este es un artículo de acceso abierto bajo la 4 Autor para la correspondencia: leonardoac@cien- licencia Creative Commons 4.0 Atribución-No cias.unam.mx; [email protected] Comercial (CC BY-NC 4.0 International). e-ISSN: 2448-7589 Acta Botanica Mexicana 126: e1388 | 2019 | 10.21829/abm126.2019.1388 1 Islas-Hernández et al.: Mitreola para México Introducción Golfo de México, del Océano Pacífico y de la Península de La familia Loganiaceae comprende plantas herbáceas, ar- Yucatán. bustivas o arbóreas; sus integrantes se distribuyen princi- En el país, los trabajos sobre el género y la familia son palmente en los trópicos y subtrópicos (Struwe et al., 1994; pocos, se carece de un conocimiento actualizado sobre su Backlund et al., 2000; Stevens, 2001; Fernández-Casas y taxonomía, distribución y conservación. Incluso en trabajos Huft, 2009; Zappi, 2009; APG IV, 2016). Aunque la familia recientes aún se incluyen sinónimos de M. petiolata como presenta una combinación distintiva de caracteres entre especies aceptadas (Villaseñor, 2016). En relación con el los que destacan la venación plinervada de sus hojas, inflo- estado de conservación, ninguna de las especies de loga- rescencias cimosas helicoidales, dicasios o escorpioideas, niáceas se ha evaluado o asignado a alguna categoría de corola gamopétala con estivación valvada o imbricada y protección de la NOM-059-SEMARNAT-2010 (SEMARNAT, ovario súpero con estilo no dividido (Stevens, 2001; Fer- 2010) o de la Unión Internacional para la Conservación de nández-Casas y Huft, 2009; Zappi, 2009), la historia taxo- la Naturaleza (IUCN, 2016). nómica del grupo es complicada y llegó a considerarse por A casi 40 años de la última revisión del género (Nel- mucho tiempo como un grupo artificial dentro del orden son, 1980), esta contribución proporciona una descripción Gentianales (Popovkin et al., 2011; APG IV, 2016). A par- morfológica detallada, con datos palinológicos novedosos, tir de análisis filogenéticos, los límites y la circunscripción una clave de los taxones morfológicamente y geográfica- de sus géneros son más claros, dejando fuera de la familia mente cercanos, así como información sobre la historia 17 géneros que ahora están circunscritos a diferentes fami- taxonómica a nivel genérico y específico. Asimismo, se pre- lias dentro y fuera de dicho orden (Backlund et al., 2000). senta un mapa con su distribución actual conocida en Mé- Actualmente la familia está conformada por 13 géneros y xico, que incluye nuevos registros, y una evaluación de su cerca de 500 especies, divididas en cuatro tribus (Frasier, estado de conservación. 2008; Gibbons et al., 2013; Yang et al., 2016). Materiales y Métodos Los trabajos realizados para Loganiaceae en México se enfocan principalmente en tratamientos taxonómicos Se llevó a cabo una revisión de especímenes depositados (Alvarado-Cárdenas, 2007; Durán-Espinosa y Castillo-Cam- en los herbarios CICY, ENCB, FCME, FEZA, HGOM, HUAA, pos, 2008; Fernández-Casas, 2009), listados florísticos (Vi- HUAP, HUMO, IBUG, IEB, IMSS, INEGI, MEXU, OAX, QMEX, llaseñor y Ortiz, 2004; Villaseñor, 2016) y descripciones de SERO, UAMIZ y XAL, así como de los presentes en los si- especies (Gould, 1999; Fernández-Casas, 2007; Alvarado- guientes herbarios virtuales del extranjero: MO, NY, TEX Cárdenas y Jiménez Ramírez, 2015; Islas-Hernández et al., y US. Se revisó literatura especializada para la obtención 2017a, b). Sin embargo, algunos de los taxones son poco de medidas y atributos para generar las descripciones ta- conocidos a nivel sistemático y la información acerca de su xonómicas. A la par, se hizo una revisión de bibliografía distribución en el país es escasa, como es el caso de Mitreo- sobre el grupo para conocer el número de especies y su la petiolata(Walter ex J.F. Gmel.) Torr. & A. Gray, distribuida distribución, así como la circunscripción y problemas no- ampliamente en los trópicos del Viejo Mundo y en América, menclaturales del taxon (Villaseñor y Ortiz, 2004; Durán- desde los Estados Unidos de América hasta Bolivia. Espinosa y Castillo-Campos, 2008; Fernández Casas y Huft, Mitreola L. comprende 13 especies herbáceas con 2009; Villaseñor, 2016). afinidades Artículopantropicales (APG IV, 2016). En el continente aceptadoPara la obtención de los datos palinológicos, se ace- Artículo aceptado americano se encuentran dos especies: Mitreola sessilifolia tolizó material de flores maduras según la
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