Open-access, online, rapid taxonomy
ISSN: 2653-4649 (Online)

Australian Journal of

Taxonomy

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Platysace summicola (Apiaceae), a rare new species from the Stirling Range, Western Australia

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Andrew J. Perkins [1,2*] & Robert W. Davis [3]

[1] Phoenix Environmental Sciences, PO Box 1031, Innaloo, Western Australia 6018, Australia.
[2] Research Associate, Western Australian Herbarium, Department of Biodiversity, Conservation and Attractions, Locked Bag 104, Bentley Delivery Centre, Western Australia 6983, Australia.
[3] 2/66 Earl Street, Albany, Western Australia 6330, Australia.

aperkins@hotmail.com.au

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Abstract

Platysace summicola, a rare species from the Stirling Range in south-western Western Australia, is here described with associated photographic images and distribution map. The new species, with distinctly winged stems, is restricted to low shrubland communities located on the upper slopes and rocky mountain summits, within the Stirling Range National Park.

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Introduction

Platysace Bunge (1845: 285) is an Australian genus of shrubby carrots (Apiaceae) (Norman 1939, Keighery 1996) containing 23 formally named species (CHAH 2010) of which, 16 occur in Western Australia (Western Australian Herbarium 1998–). The genus is morphologically diverse, with some species being erect woody shrubs up to 4 metres high, such as Platysace arnhemica Specht and Platysace saxatilis Keighery); others low spreading subshrubs, such as Platysace deflexa (Turcz.) C.Norman and Platysace tenuissima (Benth.) C.Norman); some being subshrubs fattened or winged stems like Platysace filiformis (Bunge) C.Norman and Platysace compressa (Labill.) C.Norman); and uniquely, Platysace cirrosa Bunge is a seasonal, resprouting twiner.

The purpose of this paper is to provide a valid name to a species with distinctly winged stems that has an assigned phrase name (Western Australian Herbarium 1998–) and is restricted in distribution to the upper slopes and summit areas of rocky peaks within the Stirling Range, Western Australia. The new species shares a similar habit and winged stem morphology to both Platysace compressa and P. filiformis. The novel species is formally described herein as Platysace summicola A.J.Perkins.

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Materials & Methods

This study was based on the examination of fresh material of the undescribed species and herbarium specimens of morphologically similar taxa, held at PERTH (Western Australian Herbarium). Evidence for the recognition of the new species is centred on discrete morphological characters identified from comparisons made with P. filiformis and P. compressa. Vegetative and floral characters were measured from fresh and herbarium material using a dissecting microscope and the descriptive morphological terminology used was modified from that used by Keighery (1996). A distribution map for the new species was produced from voucher specimen data using QGIS Version 3.42.2. Habitat and phenology data were collected from field observations. Images of type materials held interstate and overseas were accessed via Global Plants (https://plants.jstor.org/).

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Results

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Discussion

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Table content

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Key title

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Taxonomy

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Acknowledgments

The authors wish to thank the curators of PERTH (Western Australian Herbarium) for providing access to their vouchers; Supreema Sinha (PERTH) and Julia Percy-Bower (PERTH) for curatorial assistance. Images of interstate and overseas types were viewed via Global Plants (https://plants.jstor.org/).

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Supplementary Material

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References

Bunge, A.A. von in Lehmann, J.G.C. (ed.) (1845). Umbelliferae. Plantae Preissianae1(2): 285

CHAH (2010). Australian Plant Census, Council of Heads of Australasian Herbaria. https://biodiversity.org.au/nsl/services/APC (accessed 1 April 2025).

Keighery, G.J. (1996). A new species of Platysace (Apiaceae) from Northern Australia. Nordic Journal of Botany 16(2): 135-137

Norman, C. (1939). Notes on the genus Platysace Bunge. Journal of Botany, British and Foreign. 87: 207-211

Western Australian Herbarium (1998–). Florabase—the Western Australian Flora. Department of Biodiversity, Conservation and Attractions. https://florabase.dbca.wa.gov.au/ [accessed 4 May 2025].

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Open-access, online, rapid taxonomy ISSN: 2653-4649 (Online)

Australian Journal of

Taxonomy

Open-access, online, rapid taxonomy
ISSN: 2653-4649 (Online)