''Littorella uniflora'' (vernacular name: (American) shoreweed) is a species of aquatic

flowering plant Flowering plants are plants that bear flowers and fruits, and form the clade Angiospermae (). The term angiosperm is derived from the Ancient Greek, Greek words (; 'container, vessel') and (; 'seed'), meaning that the seeds are enclosed with ...

native to the Azores, Morocco, most of Europe excluding the dry southeast, Iceland, and the Faroes. It prefers to live mostly submerged in nutrient-poor freshwater habitats. When submerged, it draws CO₂ mostly through its roots and uses a mix of

crassulacean acid metabolism Crassulacean acid metabolism, also known as CAM photosynthesis, is a carbon fixation pathway that evolved in some plants as an adaptation to arid conditions that allows a plant to photosynthesize during the day, but only exchange gases at night. ...

(CAM) and C₃ carbon fixation for photosynthesis. If the water level drops and exposes the roots, it ceases using CAM.

References

Plantaginaceae Freshwater plants Plants described in 1864 {{Plantaginaceae-stub