121 Ruppia cirrhosa (Petagna) Grande

Syn.: R. spiralis Dum.

This widespread species is restricted to saline water at the coasts, locally also inland (Asia, N. America). Var. drepanensis Tineo in the Mediterranean area and R. maritima var. longipes Hagstr. at the eastcoast of N. America (and probably lceland; cf. Löve & Löve in Bot. Not. [Lund] 114/1961, p. 49) are tentatively mapped separately. R. spiralis has a discontinuous circumpolar distribution (Hultén, Circumpol. I, p. 134 and map 126).