Callitriche palustris var. oryzetorum (Petrov) Lansdown

Flowers with a carpellate and staminate flower in each axil, very occasionally 2 carpellate flowers and 1 staminate flower in a single axil; bracts persistent, broadly ovoid, 0.58-0.9(-1) mm; styles erect to spreading, shorter than 1.7 mm; filaments straight; 1.6-2.7 mm; anthers 0.4-0.5 × 0.3-0.4 mm. Fruit 0.7-1 × 0.6-0.8 mm, widest near middle, mature fruit brown, smooth; wing lacking or up to 0.1 mm, only at apex. Fr. Mar-Oct.