Littorella Bergius

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1976, Flora Europaea. Volume 4. Plantaginaceae to Compositae (and Rubiaceae), Cambridge University Press : 44

2. Littorella Bergius 1

Monoecious, perennial aquatic herbs. Leaves in a basal rosette, simple, sheathing at base. Male flowers 3- to 4-merous, solitary on a slender scape having 2-8, 2- to 4-merous, subsessile, female flowers at base. Corolla-tube short. Ovary 1 -locular; ovules 1 (-2). Fruit indéhiscent, hard. 1 -seeded.