Tetramerium

Tetramerium is a genus of plants belonging to the family Acanthaceae. It is found in the Americas, ranging from the southwestern United States to Bolivia, especially in tropical dry forests. Christian Gottfried Daniel Nees von Esenbeck first described the genus in 1846 after collecting two species (T. polystachyum and T. nervosum) on the journey of .

==Species== 30 species are accepted. Tetramerium abditum Tetramerium aureum Tetramerium butterwickianum Tetramerium carranzae Tetramerium crenatum Tetramerium denudatum Tetramerium diffusum Tetramerium emilyanum Tetramerium fruticosum Tetramerium glandulosum Tetramerium glutinosum Tetramerium guerrerense Tetramerium langlassei Tetramerium mcvaughii Tetramerium nemorum Tetramerium nervosum – hairy fornwort - cultivated for xeriscapes Tetramerium oaxacanum Tetramerium obovatum Tetramerium ochoterenae Tetramerium peruvianum Tetramerium rubrum Tetramerium rzedowskii Tetramerium sagasteguianum Tetramerium surcubambense Tetramerium tenuissimum Tetramerium tetramerioides Tetramerium vargasiae Tetramerium wasshausenii Tetramerium yaquianum Tetramerium zeta