RESUMENCon base en la recolección de ejemplares botánicos en diferentes regiones del estado de Hidalgo y en el estudio de material herborizado depositado en diversas colecciones institucionales, complementado con una revisión bibliográfica, obtuvimos el inventario de la flora epifítica vascular de la entidad. Como resultado de lo anterior se registran para el área de estudio 17 familias (nueve de ellas pertenecientes a las Pteridofitas y el resto a las Magnoliofitas), 64 géneros y 163 especies. Asimismo, se aportan datos sobre la distribución municipal de los taxa y un análisis sobre su representación por tipo de vegetación y por intervalo altitudinal. Se registran por primera vez para el estado los siguientes taxa: Tillandsia filifolia Schltdl. & Cham., T. heterophylla E. Morren, Pleurothallis sp. 1 y Pleurothallis sp. 2. Sólo Laelia gouldiana Rchb. f., Dignathe pygmaeum Lindl. y una especie no descrita del género Goodyera son endémicos del estado.Palabras clave: distribución, diversidad de especies, epífitas vasculares, Hidalgo, México. ABSTRACTBased on the recollection of botanical specimens in different regions of the state of Hidalgo and the study of herbarium material deposited in several institutional collections, supplemented by a literature review, we obtained records of 17 families (nine of them belonging to Pteridophytes and the rest to Angiosperms), 64 genera and 163 species. We also provide data about the municipal distribution of taxa and an analysis of their representation by

<p><strong>Background</strong>: Bromeliaceae family in Mexico has been the object of interest by botanists since 1789; their systematic study was approached from the 1970s onwards, and now there are significant advances in its taxonomic-floristic knowledge.<strong></strong></p><p><strong>Question: </strong>How many and which species of Bromeliaceae occur in Mexico? How they are distributed, and how many are endemic?</p><p><strong>Study site</strong>: México, 1887-2017.</p><p><strong>Methods</strong>: Based on the study of the Mexican Bromeliaceae, including botanical collection, literature review, and revision, analysis and determination of specimens in 50 herbaria, data about species richness, Mexican endemics, and distribution of their taxa in the country, were obtained.</p><p><strong>Results</strong>: In Mexico are represented four of the eight subfamilies of Bromeliaceae, 19 genera, 422 species, and 8 infraespecific taxa. The genera with the highest number of species in the country are <em>Tillandsia </em>(230/54.5 %), <em>Hechtia</em> (71/16.8 %) and Pitcairnia (50/11.8 %). 318 of the Bromeliaceae species are endemics to Mexico, as well as <em>Ursulaea</em> and <em>Viridantha</em> genera<em>; </em>172 species are microendemic. The entity with the highest number of taxa is Oaxaca, followed by Chiapas, Veracruz and Guerrero. Tlaxcala and Baja California Sur have the lowest species number. Baja California, Baja California Sur, Campeche, Ciudad de México, San Luis Potosí, Sonora, Tabasco y Tlaxcala have not strict endemic taxa.</p><p><strong>Conclusion</strong>: Although progress in the knowledge of Mexican Bromeliaceae has been constant, exploration and recollection work is still required before concluding the Mexican bromeliad flora. It is also necessary to promote studies considering aspects of conservation and sustainable use.</p>

Se describen e ilustran Hechtia nuusaviorum y H. perotensis. La primera es una especie endémica de Oaxaca y la segunda se conoce de los estados de Veracruz y de Puebla, de la región conocida como Valle de Perote.

The current knowledge of the bromeliad flora of the state of Oaxaca, Mexico is presented. Oaxaca is the Mexican state with the largest number of bromeliad species. Based on the study of 2,624 herbarium specimens corresponding to 1,643 collections, and a detailed bibliographic revision, we conclude that the currently known bromeliad flora for Oaxaca comprises 172 species and 15 genera. All Mexican species of the genera Bromelia, Fosterella, Greigia, Hohenbergiopsis, Racinaea, and Vriesea are represented in the state. Aechmea nudicaulis, Bromelia hemisphaerica, Catopsis nitida, C. oerstediana, C. wawranea, Pitcairnia schiedeana, P. tuerckheimii, Racinaea adscendens, Tillandsia balbisiana, T. belloensis, T. brachycaulos, T. compressa, T. dugesii, T. foliosa, T. flavobracteata, T. limbata, T. maritima, T. ortgiesiana, T. paucifolia, T. pseudobaileyi, T. rettigiana, T. utriculata, T. x marceloi, Werauhia pycnantha, and W. nutans are recorded for the first time from Oaxaca. Collections from 226 (of 570) municipalities and all 30 districts of the state were studied. Among the vegetation types occurring in Oaxaca, oak forest is the richest with 83 taxa, followed by tropical deciduous forest with 74, and cloud forest with 73 species. Species representation and distribution in Oaxaca are analyzed in detail. We also provide a comparison with bromeliad floras of the states of Chiapas, Guerrero, Puebla and Veracruz. The analysis of the species and collections by altitudinal intervals shows that the highest numbers of both ocurre between 1,500 and 2,000 m, with the number of species markedly decreasing above 2,500 m.Key words: Bromeliaceae, distribution, diversity, endemism, flora, Mexico, Oaxaca. 81: 71-147 (2007) 72 RESUMEN Se presenta el estado actual del conocimiento de la flora bromeliológica del estado de Oaxaca, México. La entidad ocupa el primer lugar en el país en cuanto a número de especies de Bromeliaceae se refiere. Los resultados obtenidos de la revisión de 2,624 ejemplares herborizados, correspondientes a 1,643 colectas, así como la revisión de bibliografía especializada, muestran que en el estado están presentes 172 especies agrupadas en 15 géneros. Bromelia, Fosterella, Greigia, Hohenbergiopsis, Racinaea y Vriesea tienen representados a todos sus taxa mexicanos. Se registran por primera vez para el estado: Aechmea nudicaulis, Bromelia hemisphaerica, Catopsis nitida, C. oerstediana, C. wawranea, Pitcairnia schiedeana, P. tuerckheimii, Racinaea adscendens, Tillandsia balbisiana, T. belloensis, T. brachycaulos, T. compressa, T. dugesii, T. foliosa, T. flavobracteata, T. limbata, T. maritima, T. ortgiesiana, T. paucifolia, T. pseudobaileyi, T. rettigiana, T. utriculata, T. x marceloi, Werauhia pycnantha y W. nutans. Se registraron colectas para 226 municipios de los 570 y para el total de los distritos (30) en los que está dividido políticamente el estado. Se hizo una comparación de la flora bromeliológica de Oaxaca con la de Chiapas, Guerrero, Puebla y Veracruz. De los tipos de vegetación pre...

The importance of documenting the plants of Mexico is undeniable considering its status as a country with biological megadiversity on one hand and the accelerated destruction of its ecosystems on the other. Ten years ago we started to compile species lists and literature for the monocotyledons that grow in Mexico, in an attempt to at least partially remedy the current lack of botanical knowledge that exists in the country. Individual electronic databases of nomenclature, bibliography, and herbarium specimens were developed. Currently these databases contain 15,560, 6,700, and 42,000 records, respectively. To date we have registered for the country 4,529 species (or 4,797 taxa including subspecies and varieties) distributed in 619 genera and 60 families (sensu Dahlgren & al., 1985). Of the total number of families, seven include only introduced representatives, whereas the other 53 possess at least some native species. The number of native species is 4,424 (4,693 taxa including subspecies and varieties). A comparison of the data obtained by us together with data reported in various floristic lists of Mexican states, as well as that from some completed regional floras, allows us to obtain statistical estimates that indicate Mexico should possess between 21,300 and 24,601 species of angiosperms. As a final perspective on the importance of the Mexican flora, if the estimate of number of seed plant species in the world is really 223,300 (Scotland & Wortley, 2003), and if we accept the estimate of number of species for Mexico as 24,601, then Mexico would have 11.01 % of the total seed plant species diversity of the entire planet.

Con base en un estudio sistemático de las especies mexicanas del complejo Tillandsia viridiflora, se clarifica su situación taxonómica y nomenclatural. Se reestablece como especie a T. macropetala, antes considerada como sinónimo. Se incluye una clave de identificación para los componentes del complejo (T. viridiflora, T. grandis y T. macropetala), así como la sinonimia completa y las descripciones detalladas de cada uno de los taxa.

No abstract

Las monocotiLedóneas nativas deL corredor BioLógico chichinautzinValeria angélica Pulido-esParza, adolfo esPejo-serna y ana rosa lóPez-ferrari universidad autónoma metropolitana-iztapalapa, departamento de Biología, herbario metropolitano, apdo. postal. 55-535, 09340 méxico, d.F., méxico. feliscatus@yahoo.com, aes@xanum.uam.mx resumen el corredor Biológico chichinautzin es una Área natural Protegida que cuenta con una extensión de 65,901 ha. en la zona se presenta una amplia variación ambiental y se encuentran representados siete tipos de vegetación en un intervalo altitudinal que va de 1200 a 3400 m. mediante la revisión de ejemplares de herbario, de bibliografía especializada y de recolección de material botánico, se obtuvo el listado de las monocotiledóneas nativas que crecen dentro de sus límites, que incluye 359 especies, 132 géneros y 25 familias. sobresalen las orchidaceae y Poaceae por su alto número de taxa; entre los grupos con plantas de distribución restringida destacan las familias orchidaceae y Bromeliaceae. dentro del área se encuentran seis elementos endémicos exclusivos.Palabras clave: catálogo de monocotiledóneas, endemismo, méxico, morelos, riqueza florística. aBstract the corredor Biológico chichinautzin is a natural protected area with an extension of 65,901 ha. Within its boundaries seven vegetation types are represented in an altitudinal range from 1200 to 3400 m. Revision of herbarium collections and bibliography, and field specimens collections, let us to obtain the inventory of native monocots species present in the area. the inventory comprises 359 species, 132 genera and 25 families. orchidaceae and Bromeliaceae stand out by their endemism level. in the area grow six exclusive species.