Lemna trisulca L. (syn. Staurogeton trisulcus (L.) Schur; star duckweed; ivy-leaved duckweed) is a species of aquatic plants in the genus Lemna (duckweed) with a subcosmopolitan distribution, occurring in quiet, freshwater habitats in cool, temperate regions. L. trisulca normally does not occur in warm, temperate regions. Unlike other duckweeds, it has submerged rather than floating fronds, except when flowering or fruiting.
The leaves usually grow submerged and are oblong-lanceolate in shape and are up to 14 mm long. They are blunt at the end and taper to a tail-like stalk at the other.
This species is widely distributed in cool-temperate regions, including Great Britain and Ireland, Asia (Bangladesh, China (Northern, Western, Southern [Taiwan, Yunnan]), India (Eastern, Northern), Indonesia (Sumatra, New Guinea), Brunei, Japan, Malaysia, Myanmar, Papua New Guinea, Pakistan, Philippines); Europe; Oceania; N. America; and S. America.
- "Lemna trisulca". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 24 January 2016.
- "BSBI List 2007". Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-01-25. Retrieved 2014-10-17.
- Parnell, J. and Curtis, T. 2012. Webb's An Irish Flora. Cork University Press. ISBN 978-185918-4783
- Clapham, A.R., Tutin, T.G. and Warburg, E.F. 1968. Excursion Flora of the British Isles. Cambridge University Press. ISBN 0 521 04656 4
- Hackney, P. (Ed.) 1992. Stewart & Corry's Flora of the North-east of Ireland. Institute of Irish Studies. The Queen's University of Belfast. ISBN 0 85389 446 9(HB)
- Ito, Y., T. Ohi-Toma, Nb. Tanaka, Nr. Tanaka, and J. Murata (umpubl.) New or noteworthy plant collections from Myanmar (8) Blyxa aubertii var. echinosperma, Lemna trisulca, and Najas tenuis. APG: Acta Phytotaxonomica et Geobotanica xx: xxx-xxx.
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