Volatile oil from fresh, aboveground parts of flowering and fruiting plant of American wormseed, Chenopodium ambrosioides L. var. anthelminticum (L.) Aellen, Chenopodiaceae also known as Mexican tea, Spanish tea, Jerusalem tea, ambrosia. Habit. Central America, U.S., Canada. Oil contains 60-70% ascaridole, the principal active constituent; p-cymene, α-terpinene, l-limonene, methadiene.
Anthelmintic.