Oxycaryum

Oxycaryum cubense Nees

Synonym: Scirpus cubensis Poepp. & Kunth

Distribution: Introduced from Tropical America

Habitat: Ditches, seems to prefer eutrophic sites with standing algae-laden water

Florida status: Invasive exotic aquatic weed

Recognition: Heads globose, with long bracts. The achene covered with white bony material.