Quereuxia

Quereuxia is an extinct genus of aquatic angiosperms known from fossil leaves and leaf rosettes primarily dating to the Late Cretaceous period. It also survived into the Paleocene. These plants are notable for their floating growth habit, with morphological features suggesting adaptation to still freshwater environments.

Classification

Morphological studies have confirmed the genus' distinctiveness based on features such as heterophyllous leaf arrangements, floating rosettes, and submerged rhizomatous growth. Quereuxia angulata, the most well-known species, has often been compared to extant members of Trapa, though differences in growth habit and floral morphology have prevented confident placement within any modern family, leaving its exact taxonomic position unresolved.

Distribution

Fossils are known from Russia, The United States, Canada and Mongolia.