Dysphania siqueirosae Sandoval-Ortega & Rodríguez-Pérez (Chenopodiaceae s. str. / Amaranthaceae s. l.) is described as a new species from the states of Aguascalientes and Zacatecas (north-central Mexico). The new species is morphologically similar to D. dissecta but it can be distinguished from the latter by the perianth being subglobose to broadly ovate in fruit, utricle not visible between basal parts of the perianth segments, the perianth segments linear-lanceolate, keeled, joined by the scarious, accrescent, and wing-like margins.

Keywords: Aguascalientes, Dysphanieae, flora of Mexico

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