Callitriche obtusangula, Le Gall

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1972, Flora Europaea. Volume 3. Diapensiacea to Myoporaceae, Cambridge: Cambridge University Press : 125

6. C. obtusangula Le Gall , 77. Morbihan 202 (1852).

Floating rosettes with 12-20 often fleshy, rhombic (rarely obovate) leaves; in terrestrial form, leaves narrowly rhombic or elliptical, fleshy, often yellowish-green. Disc of cauline hairs orbicular or elliptical, of 8-10 cells. Flowers solitary. Pollen-grains oblongellipsoid or slightly reniform. Styles erect or patent. Fruit 1 - 5 x 1 -2 mm, elliptical, brown, shallowly grooved between the parallel mericarps; mericarps with rounded, scarcely distinct margin. 2« = 10. Fresh or brackish, usually slow-moving water. S., W. & W.C. Europe, northwards to c. 54° N. Au Be Br Co Ga Ge Gr Hb He Ho Hs It Ju Lu Sa Si.