Limosella vesiculosa flower

The white Limosella vesiculosa flower has five spreading, oblong petal lobes ending in round tips. The widening calyx tube also ends in five lobes. There are four stamens of white filaments topped with small blackish anthers and a style with pale globular stigma on the superior ovary. The corolla mouth in picture is dull orange (Leistner, (Ed.), 2000; iNaturalist; https://www.botanicalrealm.com).