Hydrocotyle ranunculoides L. f.

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English Floating pennywort Status LU: n/a. 1st record: n/a.
Lëtzebuergesch Grousse Waassernuebel Status EU: established. IAS of Union concern (2016)
Français Hydrocotyle fausse renoncule RA: ISEIA: A0, Alert list. Harmonia+: 0,38
Deutsch Großer Wassernabel Wikipedia: Wikipedia - English - Floating pennywort Wikipedia - Français - Hydrocotyle fausse renoncule Wikipedia - Nederlands - Grote waternavel Wikispecies: Wikispecies - Hydrocotyle ranunculoides
Nederlands Grote waternavel Back to the list of neophytes

Report the species

Report Hydrocotyle ranunculoides to the National Museum of Natural History.

Brief description

Hydrocotyle ranunculoides L. f. is an aquatic plant that thrives in slow-flowing water bodies, particularly in ditches, canals, lakes and ponds. It prefers eutrophic waters, but it can also colonise marshes and mesotrophic water bodies. The species forms dense interwoven mats of vegetation which can quickly cover the entire water surface. Due to its vigorous growth, this plant causes loss of light and reduction in dissolved oxygen content in the water. As a consequence, the native submerged and water-edge plant species can be outcompeted, and ecosystem functions can be altered (Branquart et al. 2013).

Status and distribution in Luxembourg

Hydrocotyle ranunculoides L. f. has not yet been observed in Luxembourg.

Risk assessment

ISEIA protocol

A0 (2+3+3+3) = Alert List (Ries et al. 2013: 18).

Harmonia+ protocol

Overall risk score 0,38 = (Overall Invasion score 0,65 x Overall Impact score 0,58) (Ries et al. 2020).


  • Branquart, E., I. Stiers, L. Triest, S. Vanderhoeven, W. Van Landuyt, F. Van Rossum & F. Verloove, 2013. Harmonia database: Hydrocotyle ranunculoides L. f.. Harmonia version 1.2, Belgian Forum on Invasive Species. URL: http://ias.biodiversity.be [accessed on 2019-11-21]
  • Ries, C., Y. Krippel, M. Pfeiffenschneider & S. Schneider, 2013. Environmental impact assessment and black, watch and alert list classification after the ISEIA Protocol of non-native vascular plant species in Luxembourg. Bull. Soc. Nat. luxemb. 114: 15-21. [PDF 652 KB]
  • Ries, C., Y. Krippel & M. Pfeiffenschneider, 2020 [submitted]. Risk assessment after the Harmonia+ protocol of invasive alien vascular plant species in Luxembourg. Bulletin de la Société des naturalistes luxembourgeois.

 Page content last updated on 2020-01-24. Last proofread by Caroline Grounds on 2019-11-18.