Veronica anagallis-aquatica is a species of flowering plant in the family Plantaginaceae known by the common names water speedwell,[2] blue water-speedwell,[3]brook pimpernel.

The leaves are opposite, rather elongated and pointed at the tip, clasping the stem, and serrate-toothed in the end half, except for the lowermost that are often stalked and lacking in teeth.

[6] Similar plants include - V. catenata flowers are white or pale pink with rosy pink veins, bracts reaching the flowers, fruits broader than long, sepals spread wide open at fruiting, fruiting stalk bases forming a large angle to the stem (c. 90 deg), leaves somewhat narrow-looking and the lowest leaves unstalked.

[8] It occurs in many types of moist and wet habitat, and it is semi-aquatic, often growing in shallow water along streambanks, in ponds, and in other wetland environments.

[citation needed] It is listed as threatened in Indiana, and as endangered in Massachusetts, New Jersey, and Tennessee.