Plants creeping, with ascending or erect branches 3-7 cm. high. dioec. or almost so. Lvs spathulate, thin, c. 2·2 mm. long (1·2-(6) mm.), the larger lvs often with short side veins arising from the midrib and two lateral veins. Fls solitary, us. alternately on either side of stem, ebracteate. Filaments elongating to 2-4 mm.; anthers c. 0·4 mm. wide. Styles 1·7-2·2 mm. long. Fr. broader than long, 0.6-0.75 × 0.7-0.9 mm., thicker at base than at top; commissural groove narrow and shallow; lobes rounded, not keeled, not winged; pedicel c. 0·2 mm. long.

2n = 30

2n = 20

Monoecious or dioecious herb of wet ground with creeping unbranched stems ascending 3-7 cm, less often aquatic with submerged stems to 20 cm or more long, without definite rosettes. Terrestrial lvs (1)-2.2-(8) mm long, thin, spathulate or obovoid to suborbicular, entire, 3-5-nerved; submerged lvs slightly longer and linear or linear-spathulate, 1-nerved. Fls usually solitary in 1 lf axil of each pair, ebracteolate. Filaments 2-4 mm long; Style 1.7-2.2 mm long, ± persistent. Fr. 0.6-0.9 × 0.7-1.1 mm, suborbicular and broader than long; wing 0; faces strongly convex; commissural groove shallow and narrow.