Marsilea quadrifolia, L.

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1964, Flora Europaea - Volume 1. Lycopodiaceae to Platanaceae, Cambridge University Press : 24

1. M. quadrifolia L. , Sp. Pl. 1099 (1753).

Usually far-creeping, with nodes more than 1 cm apart. Leaves glabrous; petioles 7-20 cm; leaflets 1 -2 cm, obdeltate, with entire to slightly undulate, rounded apex. Sporocarps 3-5 mm, near base of petiole, ellipsoid, glabrescent, with small basal teeth, pedicellate; stalks 1 -2 cm, erect, 2- to 4-branched, rarely simple, usually partly connate, adnate to the petiole. S., W. and (very locally) C. Europe, northwards to France (48 ° N.), S. Poland and S. W. Ukraine; Volga delta. Al Au Bu Cz Ga Ge He Hs Hu It Ju Lu Po Rm Rs (W, E).