Callitriche sonderi

Mostly terrestrial, mat-forming. Leaves linear-obovate, 0.8–5 mm long, 0.5–1.5 mm wide, obscurely 3-veined, petiolate; upper leaves not rosetted. Flowers usually paired, a male and female together in opposite axils; bracteoles linear-triangular, 0.2–0.5 mm long, deciduous; stamen 0.4–1 mm long, not elongating as fruit ripens, filament shorter than ripe fruit; styles erect, 0.1–0.3 mm long, persistent. Fruit subcordate, 0.5–0.8 mm long, 0.7–0.9 mm wide, subsessile, distinctly thicker at base, dark brown; wing very narrow. Flowers mainly Sep.–Dec.; fruits present most of year.