Hymenothrix

{{Short description|Genus of flowering plants}}

{{Automatic taxobox

| image = Hymenothrix dissecta 3.jpg

| image_caption = Hymenothrix dissecta

| display_parents = 2

| taxon = Hymenothrix

| authority = Gray

| synonyms_ref =

| synonyms =

• Amauriopsis Rydb.
• Hutchinsonia M.E.Jones 1933, illegitimate homonym not Robyns 1928 (Rubiaceae)
• Trichymenia Rydb.

}}

Hymenothrix is a small genus of North American flowering plants in the daisy family known as thimbleheads. They are native to the southwestern United States and northern Mexico.[https://www.biodiversitylibrary.org/page/14225869#page/114/mode/1up Gray, Asa. 1849. Memoirs of the American Academy of Arts and Science, new series 4(1): 102] generic description in Latin, specific description and commentary in English

These are spindly, erect annual, biennial, and perennial herbs with white or yellow flowers.[http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=116150 Flora of North America Hymenothrix A. Gray]

; Species

The following species are recognised in the genus Hymenothrix:{{Cite web |title=Hymenothrix A.Gray {{!}} Plants of the World Online {{!}} Kew Science |url=http://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:9449-1 |access-date=2022-06-02 |website=Plants of the World Online |language=en}}[http://www.theplantlist.org/tpl1.1/search?q=Hymenothrix The Plant List search for Hymenothrix][http://bonap.net/NAPA/TaxonMaps/Genus/County/Hymenothrix Biota of North America Program 2013 county distribution maps]

• Hymenothrix autumnalis - Coahuila, Nuevo León
• Hymenothrix biternata - United States (Arizona New Mexico)
• Hymenothrix dissecta - Baja California, Sonora, Chihuahua, Coahuila, United States (California Arizona New Mexico Texas Nevada Utah Colorado Wyoming South Dakota)
• Hymenothrix glandulopubescens
• Hymenothrix greenmanii - México State
• Hymenothrix janakosiana - Chihuahua
• Hymenothrix loomisii - Loomis's thimblehead - California Nevada Arizona
• Hymenothrix palmeri - Chihuahua
• Hymenothrix pedata - Chihuahua, Coahuila, United States (New Mexico Texas)
• Hymenothrix wislizeni - Trans-Pecos thimblehead - Chihuahua, Sonora, Arizona New Mexico Texas
• Hymenothrix wrightii - Wright's thimblehead - Chihuahua, Baja California, California, Arizona, New Mexico and Texas

; formerly included

Hymenothrix purpurea Brandegee - Florestina purpurea (Brandegee) Rydb.