ResumenSe hizo un estudio florístico en la cima de la Mesa Alta, ubicada 5 km al noreste de El Cargadero, municipio de Jerez, en la región centro del estado de Zacatecas. La altitud máxima de la Mesa Alta es de 2,750 m. Se evaluó la similitud florística entre las diferentes laderas de la cima. También se estudiaron los patrones de distribución geográfica. Los resultados arrojan que la flora consta de 61 familias, 157 géneros y 237 especies. Con base en la exposición geográfica, el mayor número de especies se encontró en la cima (163 especies), seguida de las laderas oeste (122), norte (56), sur (41) y este (40). Ninguna de estas floras se agrupa con una similitud mayor al 50 %. La distribución geográfica de la flora muestra que 95 especies son de ascendencia neotropical, 77 son nativas a México y 65 son de ascendencia holártica. Se reportan dos especies en la NOM-059-SEMARNAT-2010, Dasylirion acrotrichum y Echinocereus pulchellus. La riqueza florística de la cima de la Mesa Alta es similar a otras áreas del país con bosques de coníferas. Las diferencias entre las laderas y la cima se deben a que cada una presenta características propias de topografía, pendiente, suelo y tiempo de insolación. Los resultados obtenidos fortalecen la iniciativa para decretar la cordillera de la que forma parte la Mesa Alta como Área Natural Protegida, y proporciona una base de información para futuras comparaciones con la flora de otras cimas en Zacatecas. Palabras Clave: Echinocereus pulchellus, endemismo, orientación de ladera, pino piñonero, riqueza florística. Flora on summit of the Mesa Alta, Jerez, Zacatecas, México AbstractA floristic inventory on summit of the Mesa Alta was conducted; which is located 5 km northeast of El Cargadero town, in the municipality of Jerez in the central region of Zacatecas state, Mexico. The maximum elevation of the Mesa Alta is 2,750 m. Floristic similarity between the different slopes of the summit was evaluated. Geographical distribution patterns were also studied. The results show that the flora consists of 61 families, 157 genera and 237 species. Based in the geographic exposure, the largest number of species found at the summit (163 species), followed by the western slopes (122), north (56), south (41) and east (40). None of these floras is grouped with more than 50 % similarity. The geographical distribution of flora shows that Ninety-five species of the studied flora have Neotropical ancestry, 77 are native to Mexico and 65 have Holartic ancestry. Two species are reported in NOM-059-SEMARNAT-2010, Dasylirion acrotrichum and Echinocereus pulchellus. The floristic richness of the top of the Mesa Alta is similar to other areas of the country with coniferous forests. The difference between the slopes and summit is related to its specific characteristics of topography, slope, soil, and exposure time. The results support the proposal to enact the mountain range in which Mesa Alta is as a Natural Protected Area, and provide the basic information for future flora comparisons among the peaks in Zac...
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