New records of New Zealand Pigmyweed, Crassula helmsii (Crassulaceae), in two Irish lakes

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.