Dysphania ambrosioides, known as wormseed, Jesuit's tea, Mexican-tea, payqu, epazote, mastruz, or herba sanctæ Mariæ, is an annual or short-lived perennial herb native to Central America, South America, and southern Mexico.
Dysphania ambrosioides is an annual or short-lived perennial plant (herb), growing to 1.2 m (3.9 ft) tall, irregularly branched, with oblong-lanceolate leaves up to 12 cm (4.7 in) long. The flowers are small and green, produced in a branched panicle at the apex of the stem. As well as in its native areas, it is grown in warm temperate to subtropical areas of Europe and the United States (Missouri, New England, Eastern United States), sometimes becoming an invasive weed. The species was described in 1753 by Carl Linnaeus as Chenopodium ambrosioides.