The names Ambrina dissecta, Chenopodium incisum, and Chenopodium stellatum are taxonomically assessed and their lectotypes are designated, the specimens preserved at P and GH. These three names refer to species currently placed in the genus Dysphania, but no formal combination was published for the species earlier known as Chenopodium incisum. ­Consequently, we here propose the new nomenclatural combination: Dysphania incisa (Poir.) Sandoval-Ortega & Zumaya-Mendoza, comb. nov. (based on Chenopodium incisum Poir.).

Keywords: Amaranthaceae, Chenopodiaceae, Dysphania, epazote, herbarium, lectotype, Mexico, nomenclature

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