Shinnersia

Shinnersia is an aquatic plant native to Texas and Mexico. It is classified in tribe Eupatorieae within family Asteraceae.
The genus is named in honor of Lloyd H. Shinners of the Southern Methodist University.
The roots live in the muck at the bottom of shallow slow-moving water (for example, along a stream), and the stem extends above the water slightly (less than 10 centimetres).
"Shinnersia" is a common freshwater aquarium plant, and can sometimes be found having escaped cultivation.
The only known species in the genus is Shinnersia rivularis, the Rio Grande bugheal or Mexican oak leaf plant, native to Texas, Coahuila, and Nuevo León. It is thought to be related to two other aquatic genera in this tribe, "Sclerolepis" and "Trichocoronis".