Callitriche stagnalis, Scop.

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

5. C. stagnalis Scop. , 77. Cam. ed. 2,2:251 (1772).

Submerged leaves narrowly elliptical; floating rosettes with c. 6 broadly elliptical or suborbicular, pale green leaves. In terrestrial form, leaves small, broadly elliptical or suborbicular, palegreen. Disc of cauline hairs orbicular, of 8—10(—12) cells. Flowers solitary, or 1 male and 1 female flower in the same leaf-axil. Pollen-grains subglobose. Styles in aquatic form erect or patent, in terrestial form arcuate-recurved. Fruit 1 -75 x 1-6—1 *8 mm, suborbicular, pale brownish, deeply grooved between the divergent mericarps; mericarps broadly winged, radial thickening of cells of wing often weakly developed. In = 10. Springs and still or slow-moving water. Most of Europe westwards from Estonia, W. Ukraine and Greece. All except Cr Fe Rm Rs (N, K, E) Tu.