Callitriche lusitanica, Schotsman

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

4. C. lusitanica Schotsman , Bol. Soc. Brot, ser 2, 35: 112 (1961).

Submerged leaves tapering slightly towards emarginate apex. Styles patent. Fruit 1 -2-1-4 x 1 -8-2 mm, subsessile; mericarps almost semicircular, with small seed and wide wing, the cells of the wall enclosingthe seed without stellate thickenings. 2/2 = 8. River-beds and small pools. • E. Portugal, W. & S. Spain. HsLu.

(c) Three forms: submerged and sterile; aquatic with floating rosette; and terrestrial. Submerged leaves not transparent. Disc of cauline hairs of 8-15 cells. Flowers solitary, or 1 male and 1 female flower in the same leaf-axil. Bracteoles 2. Stamen recurved and elongating after dehiscence; anther-wall with thickened cells; pollen-grains yellow, with exine. Wing of mericarp, if present, composed of a single row of radially elongated cells. Basic chromosome number 5.