Elachanthus, Isoetopsis and Kippistia are nested in the genus Minuria (Asteraceae: Astereae)

Alexander N. Schmidt-Lebuhn; Stephanie H. Chen; Alicia Grealy

doi:10.1071/SB23028

RESEARCH ARTICLE (Open Access)

Contents Vol 37(4)

Elachanthus, Isoetopsis and Kippistia are nested in the genus Minuria (Asteraceae: Astereae)

Alexander N. Schmidt-Lebuhn

^A ^* , Stephanie H. Chen

^A and Alicia Grealy ^A

+ Author Affiliations

- Author Affiliations

^A Centre for Australian National Biodiversity Research (a joint venture between Parks Australia and CSIRO), Clunies Ross Street, Canberra, ACT 2601, Australia.

^* Correspondence to: alexander.s-l@csiro.au

Handling Editor: Caroline Puente-Lelievre

Australian Systematic Botany 37, SB23028 https://doi.org/10.1071/SB23028

Submitted: 6 November 2023 Accepted: 2 July 2024 Published: 17 July 2024

© 2024 The Author(s) (or their employer(s)). Published by CSIRO Publishing. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)

Abstract

While conducting phylogenetic analyses of sequence-capture data of Australian members of Asteraceae tribe Astereae, we found that Elachanthus pusillus F.Muell., Isoetopsis graminifolia Turcz. and Kippistia suaedifolia F.Muell. formed a clade with Minuria. We, therefore, conducted an analysis focused on this clade, but with replicate samples of the three smaller genera, and confirmed our results. Kippistia had been synonymised under Minuria between 1876 and 1980, when it was reinstated. Elachanthus and Isoetopsis had not previously been suggested to be part of Minuria, and, indeed, Isoetopsis had been considered so morphologically divergent that even its tribal affiliations were long controversial. However, on closer examination, Elachanthus and Isoetopsis are strikingly similar to Minuria, especially in cypsela and pappus morphology. The evolution of both genera from a common ancestor in Minuria appears plausible in the light of their overall similarity to annual species of that genus such as M. annua, their multiple uniform rows of herbaceous phyllaries with scarious margins, a pappus of scales v. the tendency of Minuria to form pappi with scale-like bases, female outer and male inner florets, and a cypsela indumentum shared with some species of Minuria. We propose the following three new combinations under Minuria: M. pusilla, M. glabra and M. graminifolia.

Keywords: Asteraceae, Astereae, Australia, Elachanthus, Isoetopsis, Kippistia, Minuria, phylogenetics, taxonomy, typification.

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