The only submerged species of Lemna in our area, L. trisulca is frequent in mesotrophic to eutrophic, still to slowly flowing waters where low nutrient levels or exposure prevent the development of a dense blanket of floating Lemna species. Reproduction is by vegetative budding; flowering is very rare. Generally lowland, but reaching 340 m at Kingside Loch (Selkirks.).
There have been some local losses, but the distribution of L. trisulca is otherwise stable.
Circumpolar Temperate element.
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