Algunos aspectos ecológicos y fitogeográficos de las especies de Cyperaceae en el Valle de México. II. Análisis fitogeográfico

The analysis of the geographic affinities of the members of Cyperaceae belonging to the flora of the V alley of Mexico reveals that, in general terms, neotropical relationships prevail amply over the holarctic ones that were detected, while species with distribution restricted to Mexico amount to about 30% of the total number. With countries as distant as Poland and Liberia there are few species in common, although at the generic level, the similarity exceeds 50%. On a more regional scale, the cyperaceous flora of the Valley shows evident links with that of the Mexican High Plateau, but has relatively little in common with the flora of warmer parts of the country. The results support the idea of Raven and Axelrod, who claim that the family evolved initially in tropical and subtropical areas and later migrated northward and southward.