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Issue: Vol. 687 No. 2: 18 Feb. 2025
Type: Article
Published: 2025-02-18
DOI: 10.11646/phytotaxa.687.2.4
Page range: 241-266
Abstract views: 575
PDF downloaded: 17

Morphological and taxonomic assessment of the Olearia furfuracea complex (Celmisiinae, Astereae, Asteraceae)

Department of Botany, University of Otago, PO Box 56, Dunedin, New Zealand
Biota Ltda. Av. Miguel Claro 1224, Providencia, Santiago, Chile. Museo Regional de Aysén, Km 3 Camino a Coyhaique Alto, Coyhaique, Chile.
Fourier leaf morphometrics PCA systematics taxonomy decision tree k-medoids Eudicots

Abstract

The subtribe Celmisiinae (Asteraceae) is an Australasian clade of ca. 160 species across six genera. Recent morphological and molecular analyses found several well-supported clades within the subtribe. One of those clades is the “Olearia furfuracea complex”, a group of five currently recognised species endemic to the North Island of New Zealand. Although they are morphologically distinct from the rest of the subtribe, the discrimination between the five species is not so clear. This study analysed the morphological circumscription of the five species with respect to each other with the aim of testing the species boundaries. Olearia allomii and O. pachyphylla were found to be distinct from each other and the other three. Olearia furfuracea, O. thomsonii, and O. townsonii were found to grade into one another through a range of quantitative, qualitative, and morphometric analyses. Morphometric and morphological evidence supports the recognition of three species and suggests retaining only O. allomii, O. pachyphylla, and O. furfuracea. Additionally, recent studies suggest a new classification, in which Olearia species belonging to Celmisiinae should be shifted into Shawia. Accordingly, two new combinations are made: Shawia allomii (Kirk) Nicol & Saldivia comb. nov., and Shawia pachyphylla (Cheeseman) Nicol & Saldivia comb. nov. The name Shawia furfuracea is reinstated. Five heterotypic synonyms are proposed, and typification is fully revisited. Morphological descriptions, maps and illustrations are also provided.

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How to Cite

Nicol, D.A. & Saldivia, P. (2025) Morphological and taxonomic assessment of the Olearia furfuracea complex (Celmisiinae, Astereae, Asteraceae). Phytotaxa 687 (2): 241–266. https://doi.org/10.11646/phytotaxa.687.2.4