littorella

Molecular data show Littorella to be sister to the rest of the genus Plantago.

Shore-weed Littorella uniflora, a rare plant in Cheshire, is also present.

The plantain family as traditionally circumscribed consisted of only three genera, Bougueria, Littorella, and Plantago.

Some researchers, particularly Rahn in the 1990s, have considered Littorella to be located within Plantago, but this does not seem to be required given the molecular data and a closer look at morphology.

Dutch scientists have found that acid-loving rush and sphagnum species have taken over from Lobelia and Littorella (reduced from 500 to 30 sites) and 20 other rare plants of heathland pools.

CAM photosynthesis is also found in aquatic species in at least 4 genera, including: Isoetes, Crassula, Littorella, Sagittari, and possibly Vallisneria, being found in a variety of species e.g. Isoetes howellii.