bc6a6325-f688-4d47-9eae-8e0526eb9598 https://ipt.gbif.org.nz/resource?r=checklist_of_alien_plants_tristan-da-cunha checklist_of_alien_plants_tristan-da-cunha Bradley Myer Indigena Biosecurity International Director

Nelson 7010 NZ

brad@indigena.co.nz http://www.indigena.co.nz Kelvin Floyd Indigena Biosecurity International

Auckland NZ

Trevor Glass Government of Tristan da Cunha, Conservation Department Director

SH

2026-03-19 eng A checklist of alien vascular plants from Tristan da Cunha Checklist Tristan da Cunha Conservation Biodiversity invasives alien species GBIF Dataset Type Vocabulary: http://rs.gbif.org/vocabulary/gbif/dataset_type_2015-07-10.xml To the extent possible under law, the publisher has waived all rights to these data and has dedicated them to the Public Domain (CC0 1.0). Users may copy, modify, distribute and use the work, including for commercial purposes, without restriction. Creative Commons Zero v1.0 Universal https://spdx.org/licenses/CC0-1.0.html CC0-1.0 Alien vascular plants from Tristan Da Cunha -180 180 90 -90 Alien vascular plants family Commelinaceae family Corynocarpaceae family Lamiaceae family Malvaceae family Araliaceae family Oxalidaceae family Pittosporaceae family Myrtaceae order Dipsacales order Geraniales order Cucurbitales family Campanulaceae class Pinopsida order Asterales family Scrophulariaceae family Cannaceae family Plantaginaceae family Liliaceae family Rosaceae kingdom Plantae order Arecales order Ericales family Cyperaceae family Amaryllidaceae family Vitaceae order Solanales order Alismatales family Arecaceae family Apiaceae class Magnoliopsida order Fagales family Asparagaceae family Cupressaceae family Solanaceae family Caryophyllaceae order Ranunculales order Laurales family Pinaceae phylum Streptophyta order Poales family Iridaceae family Papaveraceae order Malpighiales family Araceae order Asparagales order Myrtales family Polygonaceae order Zingiberales family Onagraceae class Liliopsida family Poaceae order Malvales family Geraniaceae family Brassicaceae family Rubiaceae family Juncaceae order Boraginales family Fabaceae family Aizoaceae family Crassulaceae family Violaceae order Lamiales family Urticaceae order Caryophyllales family Araucariaceae family Caprifoliaceae family Boraginaceae family Tropaeolaceae family Lauraceae family Asphodelaceae family Moraceae order Liliales family Verbenaceae order Vitales family Hydrangeaceae family Casuarinaceae order Rosales order Fabales order Saxifragales order Commelinales family Convolvulaceae family Primulaceae order Brassicales family Nyctaginaceae order Pinales order Gentianales order Cornales family Amaranthaceae family Asteraceae order Oxalidales family Salicaceae family Euphorbiaceae order Apiales This dataset is the work of Niek Gremmen and Ruerdje Lenna Halbertsma who visited Tristan da Cunha in 2007. It also includes an update from Kelvin Floyd (Indigena Biosecurity International) in 2023 and Bradley Myer (Indigena Biosecurity International) 2025. These surveys are part of a broader programme of works to prioritise and manage alien plants This fieldwork followed the extensive 2007–2008 survey conducted by Gremmen and Halbertsma, who identified 137 alien vascular plant species and documented the threats they pose to the island’s unique endemic biodiversity and agricultural production. Two subsequent assessments were carried out under the Darwin Plus initiative (DPLUS191) through the Building Capacity for Invasive Plant Management across Tristan’s Northern Islands project, undertaken by Kelvin Floyd in 2023 and Bradley Myer in 2025. Given the limited time available, the aim of these two visits was not to conduct another extensive survey, but rather to reassess the extent of previously prioritised species and to identify any additional alien species of concern. During their assessments, Kelvin and Bradley surveyed the distribution where possible of the species identified by Gremmen and Halbertsma, and recorded a combined total of 33 additional alien species. This brings the total number of introduced plant species recorded on Tristan da Cunha to 170. It includes agricultural species (beneficial and undesirable), garden plants and escapees, and horticultural species (beneficial and undesirable). These surveys and this dataset are the result of human observations in 2007, 2023 and 2025.  Acknowledging the support of the Conservation Department on Tristan da Cunha, the Royal Society for the Protection of Birds and Darwin Plus. This fieldwork followed the extensive 2007–2008 survey conducted by Niek Gremmen and Ruerdje Lenna Halbertsma, who identified 137 alien vascular plant species and documented the threats they pose to the island’s unique endemic biodiversity and agricultural production. Their work has been included in this dataset asNeeded Bradley Myer Indigena Biosecurity International

Nelson 7010 NZ

brad@indigena.co.nz http://www.indigena.co.nz Data was recorded in the field then synced to the cloud and then aggregated with the other datasets. An extensive survey was conducted by Gremmen and Halbertsma, in 2007 - 2008. They spent 4 months on the island and identified 137 alien vascular plant species and documented the threats they pose to the island’s unique endemic biodiversity and agricultural production. Kelvin Floyd and Bradley Myer visited the island in 2023 and 2025 respectively. Their focus was re assessing the highest priority species based on the ecological impact of the alien invasive species. Alien species are primarily focused around the settlement of Edinburgh of the Seven Seas. Data in 2023 and 2025 was recorded directly onto mobile digital devices and the synced to the cloud In 2023 and 2025 data was selected from dropdown lists, which included the species list from Gremmen and Halbertsma, in 2007 - 2008. There were fields for including adventive species. Plantnet was used to verify unknown species. Bradley Myer contentProvider Rapidly spreading invasive plant species threaten unique biodiversity values and community livelihoods in the Tristan archipelago. This project will eradicate all known New Zealand Flax plants on Inaccessible Island World Heritage Site, plus train and enable a Tristan-led eradication of all emergent Pōhutukawa trees and self-sown Monterey pine on Tristan itself. A comprehensive survey of all Tristan’s other invasive plants will provide Tristan Conservation with a prioritised long-term management & eradication strategy, safeguarding natural habitats and vital agricultural land. This project is managed by the Royal Society for the Protection of Birds This project is generously supported by Darwin Plus. DPLUS191 is a main sized project. https://darwinplus.org.uk/project/DPLUS191 Darwin Plus (main) DPLUS191 https://darwinplus.org.uk/project/DPLUS191 The Tristan archipelago is one of the remotest in the world, home to 95+ unique species which have evolved in isolation. With the transport of people and goods across the globe, many plant species have been introduced into novel areas, with devastating and far-reaching consequences for the native biodiversity. The project will support Tristanian-led efforts to eradicate the estimated 8-9k emergent Pōhutukawa which occur over a c.100ha area on Tristan. Tristanians will also lead on removal of all self-sown Monterey pine, a notorious invasive which is spreading from one planted timber stand into both pastureland and natural sites. A NZ-based invasive plant expert (Bradley Myer and Kelvin Floyd from Indigena Biosecurity International) will provide in-person safe herbicide training and eradication protocol / strategy development support, plus work alongside Tristanians to re-map and strategise around the other invasive plant species previously identified on Tristan itself. The project will also complete the final three years of eradication effort estimated required to remove all emergent flax plants within the known invaded area on Inaccessible Island, delivering one of the primary conservation management objectives for this UK World Heritage Site 2026-03-16T02:32:10.790+00:00 dataset Myer B, Floyd K (2026). Checklist of Alien Vascular Plants of Tristan da Cunha. Version 1.2. Kaitiaki o te Ngahere. Checklist dataset. https://ipt.gbif.org.nz/resource?r=checklist_of_alien_plants_tristan-da-cunha&v=1.2 bc6a6325-f688-4d47-9eae-8e0526eb9598/v1.2.xml