| 词条 | Iostephane |
| 释义 |
|image = IostephaneheterophyllaUNAM.JPG |image_width = 220px |image_caption = Iostephane heterophylla |regnum = Plantae |unranked_divisio = Angiosperms |unranked_classis = Eudicots |unranked_ordo = Asterids |ordo = Asterales |familia = Asteraceae |genus = Iostephane |genus_authority = Benth. |type_species = Iostephane heterophylla |type_species_authority = (Cav.) Benth. |synonyms_ref=[1] |synonyms=*Pionocarpus S.F.Blake |tribus=Heliantheae[1] |}}Iostephane is a genus of Mexican flowering plants in the sunflower family.[2][3][4] 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 [5] suggested that there is an unexpectedly close relationship between Iostephane and Dendroviguiera [6] (Viguiera sect. Maculatae), a genus of shrubs and trees that is also endemic to Mexico.
References1. ^1 2 Flann, C (ed) 2009+ Global Compositae Checklist {{Taxonbar|from=Q9009189}}{{Heliantheae-stub}}2. ^[https://www.biodiversitylibrary.org/page/657503#page/371/mode/1up Bentham, George. 1873. Genera Plantarum 2: 368] in Latin 3. ^Strother, J. L. 1983. Pionocarpus becomes Iostephane (Compositae: Heliantheae): a synopsis. Madroño 30: 34-48. 4. ^Tropicos, Iostephane Benth. 5. ^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. 6. ^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. 3 : Heliantheae|Endemic flora of Mexico|Asteraceae genera |
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