Native maize field weed communities in south‐central Mexico

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Abstract
Maize (Zea mays L.) field weeds of an important agricultural region of south‐central Mexico were analysed for their phytogeographical composition, using data from a floristic list (317 species) and the cover values of 378 Braun–Blanquet relevés. Exotic species played a small role (16% of species, 13% of weed vegetation cover). The fields were dominated by species distributed between Mexico and Central America (14/47%) and those New World species with a wide distribution on the American continent, including temperate areas (10/20%). Other area types (Mexican endemics, species of warmer America, species with northern affiliations and species of Old World origin) may contribute numerous species, but these are not as competitive. The data show that native anthropogenic weed communities have evolved in Mesoamerica.

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