- Trapaceae, family Trapaceae - family comprising solely the genus Trapa; in some classifications treated as a subfamily or tribe of the family Onagraceae
--1 is a kind of dicot family, magnoliopsid family
--1 is a member of Myrtales, order Myrtales, Thymelaeales, order Thymelaeales
--1 has members: Trapa, genus Trapa