New records of New Zealand Pigmyweed, Crassula helmsii (Crassulaceae), in two Irish lakes
DOI:
https://doi.org/10.33928/bib.2025.07.037Keywords:
Invasive aquatic plant, Lough Gowna, Lough CaraghAbstract
Crassula helmsii (Kirk) Cockayne (New Zealand Pigmyweed) is an invasive aquatic macrophyte first recorded on the island of Ireland in 1984. Since then, it has been found at numerous sites on the island, mostly in the east and south. This note provides information on new records collected in the Summer of 2023 in two Irish lakes. The records show a continued spread from east to west and provide confirmation of its presence in the headwaters of the largest riverine system on the island.
References
Dehnen-Schmutz, K., Walker, K.J. & Stroh, P.A. 2020. Crassula helmsii (Kirk) Cockayne. In: BSBI Online Plant Atlas 2020, eds. P.A. Stroh, T.A. Humphrey, R.J. Burkmar, O.L. Pescott, D.B. Roy, & K.J. Walker. [online]. [Accessed 01 May 2024]. Available at: <https://plantatlas2020.org/atlas/2cd4p9h.g2z>.
Environmental Protection Agency. 2023. Ireland’s National Water Quality Monitoring Programme, 2022-2027. Wexford, Ireland: Environmental Protection Agency.
Government of Ireland. 2011. European Communities (Birds and Natural Habitats) Regulations 2011 (S.I. No. 477/2011). Dublin: Stationery Office.
Millane, M. & Caffrey, J. 2014. Risk assessment of Crassula helmsii Kirk (Cockayne) - Australian Swamp Stonecrop. Galway, Ireland: Inland Fisheries Ireland and National Biodiversity Data Centre.
Reynolds, S.C.P 2002. A catalogue of alien plants in Ireland. National Botanic Gardens. Occasional Papers No. 14. Dublin: Office of Public Works.
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