Taraxacum pseudohamatum Dahlst. (Asteraceae, Cichorioideae) – a new naturalisation from the Chatham Islands, Aotearoa / New Zealand

Karst Meijer¹, André Aptroot², Tianyi Tang³, Peter J. de Lange^{3, *}

Affiliation:
1 Herbarium Frisicum, Schoolstraat 19b, 8471 CC, Wolvega, The Netherlands
2 Laboratório de Botânica / Liquenologia, Instituto de Biociências, Universidade Federal de Mato Grosso do Sul – Avenida Costa e Silva s/n, Bairro Universitário, CEP 79070-900, Campo Grande, Mato Grosso do Sul, Brazil
3 School of Environmental and Animal Sciences, Unitec, Private Bag 92025, Victoria Street West, Auckland 1142, New Zealand

* Corresponding author: pdelange@unitec.ac.nz

Received: 22 January 2024 | Accepted: 7 March 2024 | Published: 23 May 2024
Associate Editor: Emmanuele Farris
https://doi.org/10.34074/pibdiv.002106

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Abstract:
Taraxacum pseudohamatum is reported from Rēkohu / Wharekauri / Chatham Island in the Chatham Islands, Aotearoa / New Zealand. This species is an addition to that island group’s naturalised flora and the New Zealand Botanical Region. It is also the second member of Taraxacum Sect. Hamatum to be recorded from the islands. The first species of that section to be recorded from the islands is Taraxacum hamatum, which is still only known from a collection made from Hokorereoro / Rangatira / South East Island. Taraxacum pseudohamatum is locally common on Rēkohu / Wharekauri / Chatham Island. The species is described using material from that island, and notes on its recognition and distinction from T. hamatum presented. The ecology of the species on Rēkohu / Wharekauri / Chatham Island is described.