Quinoa is in Amaranthaceae, the amaranth family.
Amaranthaceae is a family of flowering plants known as the amaranth family . Quinoa ( [ ˈkiːnwɑː ] or [ kɪˈnoʊ.ə ] , from Quechua kinwa or kinuwa ) is the common name for Chenopodium quinoa , a flowering plant in the amaranth family Amaranthaceae .