水芫花属（Pemphis）是千屈菜科下的一属，主要生长在沿海地区，1775年提出。水芫花属有极高的适应性，根据环境因素不同，它可以延伸枝条，生长为灌木或矮树。

Pemphis is a genus of maritime plants in family Lythraceae. It was recently thought have only one species (the type species, described in 1775, Pemphis acidula ) but is now believed to have at least two.

Pemphis are highly adaptive. Depending on environmental factors, they are densely branched, or low and spreading bushes or short trees, with main stems that can be furcated and lie nearly prone, or develop into one erect trunk. Leaves can be small, fleshy and succulent, or larger, flat and not fleshy. All surfaces are covered generally in silky, colorless trichomes. The fruits and bee-pollinated flowers are produced throughout the year. Seeds can float, and are sometimes propagated through water dispersal.