Dysphania ambrosioides, formerly Chenopodium ambrosioides, known as Jesuit's tea, Mexican-tea, payqu (paico), epazote, mastruz, or herba sanctæ Mariæ, is an annual or short-lived perennial herb native to Central America, South America, and southern Mexico.

Dysphania is a genus of plants in the family Amaranthaceae. Species of the genus are found worldwide from the tropics and subtropics to warm-temperate regions.