Quereuxia angulata is a bizarre and distinctive aquatic angiosperm from the Late Cretaceous, known from fossil sites across North America and Asia. Despite being common in the fossil record, its evolutionary relationships remain unclear. It was originally thought to be closely related to the modern water caltrop (Trapa) due to its overall form: many small, floating leaves attached by long stems to a central axis in a rosette pattern.

However, detailed studies of the leaf epidermis do not support a connection to Trapa, leaving its true affinities unknown. Microscopic features of the leaves also suggest adaptations to seasonal droughts, possibly allowing the plant to survive fluctuating water levels in ponds and floodplains.

Quereuxia was a common component of Cretaceous freshwater ecosystems, frequently found alongside aquatic ferns, lotuses, and water lilies in ancient lakebeds and wetlands. It survived the end-Cretaceous mass extinction and remained widespread into the Paleocene, before eventually going extinct.