This aquatic herb features an obovoid or elongated stoloniferous rootstock. Its leaves are oblong, linear-oblong, or linear-lanceolate, with an acute or obtuse apex and a rounded base. The inflorescence is a pedunculate spike densely flowered with bisexual yellow flowers. Its fruit is a follicle that is sub-globose with a short terminal beak, and its seeds are ribbed and striate.