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ARREGUIN-SANCHEZ, María de la Luz; FERNANDEZ-NAVA, Rafael; QUIROZ-GARCIA, David Leonor  and  ACOSTA-CASTELLANOS, Salvador. Analysis of the distribution of species of ferns and allies from Valley of Mexico, ecological and floristic notes. Polibotánica [online]. 2009, n.28, pp.15-36. ISSN 1405-2768.

An analysis of distribution for 40 genera and 113 species of pteridophytes from the Valley of Mexico according vegetation's types of Rzedowski (2001) is presented. We found 54% of the species in cloud forest; 45% in conifers forests; 33.6% in Quercus forest; 34.5% in grasslands; 28% in xero-philous scrubs; 22% in pine-oak forest; 3.5% in Quercus scrub and 1.8% in aquatic vegetation as in halophyllous vegetation. The affinities between the pteridophytes of the different communities were analyzed using presence/absence data with the Sörensen's similarity index and UPGMA method to construct the dendrogram, and we found more similarity between Pinus forest and the Abies forest. Quercus forest is related to the cloud forest, and the xerophilous scrubs is similar with glassland. The hallophyllous vegetation has little relation with another communities and the aquatic vegetation has not relation with any other.

Keywords : Pteridophytes; Valley of Mexico; ecological distribution; cluster analysis.

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