Coefficient of Conservatism:
Coefficient of Wetness:
A. A. Reznicek
Sandy to mucky shores, interdunal swales, and clearings, usually periodically inundated.
Under magnification (20×) and good illumination, the surface of the capsule appears covered with minute transverse striations, while in Ammannia it is smooth. This easily overlooked little plant is sometimes confused with Ammannia and also with the common Ludwigia palustris, which usually has much broader leaves than the linear to narrowly elliptic ones of Rotala, and which also has longer calyx lobes without appendages between them.