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Issue: Vol. 678 No. 1: 23 Dec. 2024
Type: Article
Published: 2024-12-23
DOI: 10.11646/phytotaxa.678.1.9
Page range: 83-95
Abstract views: 39
PDF downloaded: 25

Characterisation of Adelopetalum argyropus (Orchidaceae; Malaxideae) with the description of two related new species and two new combinations

Kalaru, New South Wales, 2550, Australia
Centre for Australian National Biodiversity Research (Joint Venture Between Parks Australia and CSIRO), GPO Box 1700, Canberra, ACT, 2601, Australia
Centre for Australian National Biodiversity Research (Joint Venture Between Parks Australia and CSIRO), GPO Box 1700, Canberra, ACT, 2601, Australia
Botany & N.C.W. Beadle Herbarium, University of New England, Armidale, NSW 2351, Australia
Norfolk Island National Park and Botanic Garden, Norfolk Island, Australia
Bonville, New South Wales, 2450, Australia
Lord Howe Island Museum, Lord Howe Island, New South Wales, 2898, Australia
Norfolk Island National Park and Botanic Garden, Norfolk Island, Australia
Norfolk Island National Park and Botanic Garden, Norfolk Island, Australia
Orchidaceae Australasia threatened species Bulbophyllum Bulbophyllinae Monocots

Abstract

The Adelopetalum argyropus species complex is distributed across eastern Australia, Lord Howe Island, Norfolk Island, New Caledonia and New Zealand. We undertook morphological examination of living plants and fresh flowers, dissected flowers mounted on cards, dried and spirit-preserved herbarium specimens and made images of living flowers. We characterise Adelopetalum argyropus as endemic to Norfolk Island. Two previously confused species, one from mainland Australia, A. continentale, and another from Lord Howe Island, A. howense, are described here as new. Extinction risk is preliminarily assessed for the three taxa: A. continentale was severely impacted by the 2019–2020 bushfires on mainland Australia, whereas A. argyropus and A. howense are each restricted to small oceanic islands; Norfolk Island and Lord Howe Island respectively.

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