About Ammannia auriculata Willd.
Ammannia auriculata, commonly known as eared redstem, is a species of flowering plant in the family Lythraceae. It occurs across much of the world in tropical and subtropical areas. This slender, erect herb usually grows between 5 and 40 centimetres (2 to 16 inches) in height. It produces orange-purple flowers when it blooms in March.
In Australia, the species grows in black loamy soils, and is found along the swampy margins of streams in scattered areas of the Kimberley and Pilbara regions of Western Australia. Its range in Australia extends into the Northern Territory and Queensland. In the United States, it can be found in Alabama, Arizona, Louisiana, Texas, South Dakota, Nebraska, New Mexico and Mississippi. It also occurs across most of Central America, in Southern China, and in parts of Asia. It is commonly found growing as a weed in rice paddies and on damp disturbed soil.
