Callitriche brutia, Petagna

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 : 125-126

11. C. brutia Petagna , Inst. Bot. 2: 10 (1787)

( C. pedunculata DC. ).

Usually slender. Submerged leaves linear, not widened at apex, often irregularly emarginate; floating rosettes with elliptical or slightly obovate leaves; in terrestrial form, leaves elliptical, dark green. Disc of cauline hairs elliptical, often somewhat irregular in outline, of 8-16 cells. Pollen-grains subglobose. Styles deflexed, appressed to sides of fruit. Fruit 1 -1-4 x 1 -1-2 mm, suborbicular or slightly longer than wide, subsessile in aquatic form, with stalk up to 13 mm in terrestrial form; mericarps mostly broadly winged. In = 28. Still, often shallow water. • W. & S. Europe, eastwards to Italy; one station in S. Sweden. Be BI Br Da Fa Ga Hb Hs Is It Lu No Sa Si Su.

Small aquatic forms of 10 and 11 are difficult to separate. C. naftolskyi Warburg & Eig, Feddes Repert. 26: 84 (1929), from Israel, is doubtfully recorded from Sardegna; it has fruits with very long stalks and ripening in the soil, broadly winged mericarps with a complex wing-structure, and the disc of the cauline hairs composed of 12-19 cells.

(e) Always terrestrial. Leaves elliptical or spathulate. Disc of cauline hairs of 4-8 cells. 1 male and 1 female flower in the same leaf-axil. Bracteoles absent. Wing of mericarp composed of a single row of short cells with thickening on the radial and proximal walls. Basic chromosome number probably 5.