Tetraneuris

{{short description|Genus of flowering plants}}

{{Automatic taxobox

|image = Hymenoxis acaulis form.jpg

|image_caption = Tetraneuris acaulis in cultivation

|display_parents = 3

|taxon = Tetraneuris

|authority = E.L.Greene 1898

|type_species = Tetraneuris acaulis

|type_species_authority = (DC.) E.L.Greene 1898

|synonyms_ref =

|synonyms = * Rydbergia Greene

}}

Tetraneuris, commonly known as four-nerve daisy{{PLANTS|id=TETRA17|taxon=Tetraneuris|accessdate=9 December 2015}} or bitterweed, is a genus of North American plants in the sneezeweed tribe within the daisy family.[https://www.biodiversitylibrary.org/item/52470#page/296/mode/1up Greene, Edward Lee. 1898. Pittonia 3(18A): 265–270] in English[http://www.tropicos.org/Name/40012032 Tropicos, Tetraneuris Greene ]

The genus includes one annual species, Tetraneuris linearifolia, with all the other species being perennials.

The name is of Greek origin, deriving from tetra, meaning "four", and neuron, meaning "nerve", which refers to the venation of the rays: three-lobed with the outer lobes themselves having an apparent vein down the middle.

; Species[http://dixon.iplantcollaborative.org/compositaeweb/default.aspx?Page=NameDetails&TabNum=0&NameId=39862d9b-e7bb-4fd5-a42d-e4886bd86c42 Flann, C (ed) 2009+ Global Compositae Checklist ] {{webarchive|url=https://archive.today/20150117235343/http://dixon.iplantcollaborative.org/compositaeweb/default.aspx?Page=NameDetails&TabNum=0&NameId=39862d9b-e7bb-4fd5-a42d-e4886bd86c42 |date=2015-01-17 }}[http://www.theplantlist.org/tpl1.1/search?q=Tetraneuris The Plant List search for Tetraneuris]Turner, B. L. 2013. The comps of Mexico. A systematic account of the family Asteraceae (chapter 11: tribe Helenieae). Phytologia Memoirs 16: 1–100[http://bonap.net/NAPA/TaxonMaps/Genus/County/Tetraneuris Biota of North America Program 2013 county distribution maps]

• Tetraneuris acaulis – western Canada, western USA, northern Mexico
• Tetraneuris argentea – Arizona, New Mexico
• Tetraneuris herbacea – Ontario, Michigan, Ohio, Illinois
• Tetraneuris ivesiana – Utah, Colorado, New Mexico, Arizona
• Tetraneuris linearifolia - Tamaulipas, Coahuila, Nuevo León, Kansas, Oklahoma, Texas, New Mexico
• Tetraneuris scaposa – Chihuahua, Tamaulipas, Coahuila, Nuevo León, San Luis Potosí, Zacatecas, Nebraska, Kansas, Oklahoma, Texas, Colorado, New Mexico
• Tetraneuris torreyana – Arizona, New Mexico, Utah, Colorado, Wyoming, Montana
• Tetraneuris turneri – Coahuila, Texas
• Tetraneuris verdiensis – Arizona

; formerly included

see Hymenoxys

• Tetraneuris brandegeei - Hymenoxys brandegeei
• Tetraneuris grandiflora - Hymenoxys grandiflora