Iostephane Explained

Iostephane is a genus of Mexican flowering plants in the family Asteraceae.^[1] ^[2] ^[3] They were first published in G.Bentham & J.D.Hooker, Genera Plantarum Vol.2 on page 368 in 1873.^[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 by Schilling in 1991,^[5] 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.^[6]

Species

As accepted by Plants of the World Online,^[4] and Global Compositae Checklist;^[7]

Iostephane heterophylla (Cav.) Benth. – widespread from Chihuahua to Oaxaca
Iostephane madrensis (S.Wats.) Strother – Chihuahua
Iostephane papposa J. J. Fay – Oaxaca
Iostephane trilobata Hemsl. – Chiapas, Oaxaca, Puebla, México State

Notes and References

https://www.biodiversitylibrary.org/page/657503#page/371/mode/1up Bentham, George. 1873. Genera Plantarum 2: 368
Strother, J. L. 1983. Pionocarpus becomes Iostephane (Compositae: Heliantheae): a synopsis. Madroño 30: 34-48.
http://www.tropicos.org/Name/40031309 Tropicos, Iostephane Benth.
Web site: Iostephane Benth. Plants of the World Online Kew Science . Plants of the World Online . 2 November 2023 . en.
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.
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.
http://dixon.iplantcollaborative.org/CompositaeWeb/default.aspx?Page=NameDetails&TabNum=0&NameId=2ed3518e-4091-441d-9e4c-19f2409e14da Flann, C (ed) 2009+ Global Compositae Checklist