Tetramerium

{{Short description|Genus of flowering plants}}

{{Automatic taxobox

|image = Tetramerium nervosum (7554591904).jpg

|image_caption = Tetramerium nervosum

|display_parents = 2

|taxon = Tetramerium

|authority = Nees (1846)

|subdivision_ranks = Species

|subdivision = 30; see text

|subdivision_ref = [https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:327080-2 Tetramerium Nees]. Plants of the World Online. Retrieved 7 February 2024.

|synonyms = Averia {{small|Leonard (1940)}}

|synonyms_ref =

}}

Tetramerium is a genus of plants belonging to the family Acanthaceae. It is found in the Americas,{{cite journal | author = Daniel, T. F. | author2 = McDade, L. A. | author3 = Manktelow, M. | author4 = Kiel, C. A. | name-list-style = amp | year = 2008 | title = The "Tetramerium Lineage" (Acanthaceae: Acanthoideae: Justicieae): Delimitation and intra-lineage relationships based on cp and nrlTS sequence data | journal = Systematic Botany | volume = 33 | issue = 2 | pages = 416–436 | url = http://researcharchive.calacademy.org/research/curators/pdfs/tetramerium_lineage.pdf | doi=10.1600/036364408784571581| s2cid = 85891790 }} ranging from the southwestern United States to Bolivia, especially in tropical dry forests.{{cite journal | author = Daniel, T. F. | year = 1986 | title = Systematics of Tetramerium (Acanthaceae) | journal = Systematic Botany Monographs | volume = 12 | pages = 1–134| doi = 10.2307/25027630 | jstor = 25027630 }} 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 {{HMS|Sulphur|1826|6}}.{{cite book |author1=Nees von Esenbeck |author2=C. G. | year = 1846 | chapter = Acanthaceae | title = The botany of the voyage of H.M.S. Sulphur | editor = G. Bentham | pages = 145–149 | location = London | publisher = Smith, Elder and Co. | url = https://www.biodiversitylibrary.org/bibliography/908}}