{{Short description|Genus of flowering plants}} {{Automatic taxobox |image = IostephaneheterophyllaUNAM.JPG |image_caption = ''Iostephane heterophylla'' |display_parents = 3 |taxon = Iostephane |authority = Benth. |type_species = ''Iostephane heterophylla'' |type_species_authority = (Cav.) Benth. |synonyms_ref = <ref name=o/> |synonyms = * ''Pionocarpus'' <small>S.F.Blake in Proc. Amer. Acad. Arts 51: 521 (1916)</small> }} '''''Iostephane''''' is a genus of Mexican flowering plants in the family Asteraceae.<ref>[https://www.biodiversitylibrary.org/page/657503#page/371/mode/1up Bentham, George. 1873. Genera Plantarum 2: 368] in Latin</ref><ref>Strother, J. L. 1983. ''Pionocarpus'' becomes ''Iostephane'' (Compositae: Heliantheae): a synopsis. Madroño 30: 34-48.</ref><ref>[http://www.tropicos.org/Name/40031309 Tropicos, ''Iostephane'' Benth.]</ref> They were first published in G.Bentham & J.D.Hooker, Genera Plantarum Vol.2 on page 368 in 1873.<ref name="Powo">{{cite web |title=''Iostephane'' Benth. {{!}} Plants of the World Online {{!}} Kew Science |url=https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:9496-1 |website=Plants of the World Online |access-date=2 November 2023 |language=en}}</ref>
The species are rosette-forming herbaceous perennials that produce relatively large heads with yellow or purple (''I. heterophylla'') rays. They have large, somewhat quadrate cypselae (achenes), that may either have or lack a pappus.
Molecular phylogenetic studies by Schilling in 1991,<ref>Schilling, E. E. and J. L. Panero. 1991. Evidence for a close relationship between ''Iostephane'' and ''Viguiera'' sect. ''Maculatae'' (Asteraceae: Heliantheae). American Journal of Botany 78: 1054-1062.</ref> suggested that there is an unexpectedly close relationship between ''Iostephane'' and ''Dendroviguiera'' (formerly ''Viguiera'' sect. ''Maculatae''), a genus of shrubs and trees that is also endemic to Mexico.<ref>Schilling, E, E. and J. L. Panero 2011. A revised classification of subtribe Helianthinae (Asteraceae: Heliantheae). II. Derived lineages. Botanical Journal of the Linnean Society 167: 311-331.</ref>
==Species== As accepted by Plants of the World Online,<ref name="Powo"/> and Global Compositae Checklist;<ref name=o>{{Cite web |url=http://dixon.iplantcollaborative.org/CompositaeWeb/default.aspx?Page=NameDetails&TabNum=0&NameId=2ed3518e-4091-441d-9e4c-19f2409e14da |title=Flann, C (ed) 2009+ Global Compositae Checklist |access-date=2014-12-09 |archive-date=2014-12-09 |archive-url=https://archive.today/20141209155630/http://dixon.iplantcollaborative.org/CompositaeWeb/default.aspx?Page=NameDetails&TabNum=0&NameId=2ed3518e-4091-441d-9e4c-19f2409e14da |url-status=dead }}</ref> * ''Iostephane heterophylla''<small> (Cav.) Benth.</small> – widespread from Chihuahua to Oaxaca * ''Iostephane madrensis''<small> (S.Wats.) Strother</small> – Chihuahua * ''Iostephane papposa''<small> J. J. Fay</small> – Oaxaca * ''Iostephane trilobata''<small> Hemsl.</small> – Chiapas, Oaxaca, Puebla, México State
==References== {{Reflist}}
{{Taxonbar|from=Q9009189}}
Category:Heliantheae Category:Endemic flora of Mexico Category:Asteraceae genera Category:Plants described in 1873
{{Heliantheae-stub}}