| Sumario: | Based on an intense fieldwork, on the critical review of the specimens of Asteraceae held in three important Mexican herbaria, as well as the study of specialized literature, a checklist of the Asteraceae of the state of Zacatecas is provided. The checklist includes 141 genera, 456 species, and 119 infraspecific taxa, distributed in 14 tribes. The tribes with the largest number of taxa are Heliantheae (50 genera and 149 species), Astereae (22 and 68), and Eupatorieae (17 and 96). The most diverse genera are Stevia (27 species), Ageratina (23), Brickellia (21), Viguiera (15), Verbesina (14), Pseudognaphalium (13) and Acourtia (12). Fifty four percent of the species occurring in Zacatecas are endemic to Mexico, four of them plus one variety are restricted to the political boundaries of the state. The largest number of endemisms are shared with Durango and Jalisco, two neighbor states. In Zacatecas the Asteraceae constitute the most diversified family of flowering plants. Its richness is largely the result of the confluence in the state of four physiographic provinces (Sierra Madre Occidental, Sierra Madre Oriental, Central Plateau and Transvolcanic Belt), as well as of the confluence of the Holarctic and Neotropical Floristic Kingdoms.
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