Myriophyllum aquaticum (Vell.) Verdc.

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English Parrot’s-feather Status LU: established. 1st record: ~1990
Lëtzebuergesch Brasilien-Waassergras Status EU: established. IAS of Union concern (2016)
Français Myriophylle du Brésil RA: ISEIA: B1, Watch List. Harmonia+: 0,51
Deutsch Brasilianisches Tausendblatt Wikipedia: Wikipedia - English - Parrot's-feather Wikipedia - Français - Myriophylle du Brésil Wikipedia - Deutsch - Brasilianisches Tausendblatt | Wikispecies: Wikispecies - Myriophyllum_aquaticum | CABI
Nederlands Parelvederkruid Back to the list of neophytes

Report the species

Report Myriophyllum aquaticum to the National Museum of Natural History.

Brief description

Myriophyllum aquaticum (Vell.) Verdc. is an invasive submerged/emergent aquatic weed characteristic of sub-tropical to warm-temperate regions, but found as far north as the UK. The species thrives in well-lit ponds, ditches, canals and slow-running streams. It is most often found in eutrophic water bodies and is able to grow as a terrestrial plant when ponds dry out, making it well-adapted to medium water level fluctuations (Branquart et al. 2013).

Status and distribution in Luxembourg

Distribution map of Myriophyllum aquaticum (Vell.) Verdc. in Luxembourg. Data source: Recorder-Lux, iNaturalist & GBIF, 2019-12-05.

Myriophyllum aquaticum (Vell.) Verdc. was first documented by Roland Proess in his Herbarium in June 2000 at Freschewisen near Roeser, a dead branch stream of the Alzette river. According to Proess, this large population in a pond has existed for at least 10 years (Colling & Krippel 2003: 16). Parrot’s-feather’s first record for Luxembourg can thus approximately be dated to ~1990.

Another observation by Mikka Mootz on 1 April 2019 in a nearby pond in Houwisen confirms the presence of the species in the same area. It is currently the only record accessible through the MNHNL-mdata portal (MNHNL, iNaturalist & GBIF 2019).

This eastern North American species is very rare, subspontaneous or naturalised [in the Luxembourg environment]. In Europe, only female flowers have been reported, which are necessarily sterile in the absence of male flowers. Apparently, however, the plants observed in the wild are only known in the vegetative state. This species became naturalised here during the 1990s. Its expansion seems to be continuing (Lambinon & Verloove 2012: 422-423).

Risk assessment

ISEIA protocol

B1 (2+2+3+3) = Watch List (Ries et al. 2013: 18).

Harmonia+ protocol

Overall risk score 0,51 = (Overall Invasion score 0,68 x Overall Impact score 0,75) (Ries et al. in prep.).

Bibliography

  • Branquart, E., L. Triest, S. Vanderhoeven, W. Van Landuyt, F. Van Rossum & F. Verloove, 2013. Harmonia database: Myriophyllum aquaticum (Vell.) Verdc. Harmonia version 1.2, Belgian Forum on Invasive Species. URL: http://ias.biodiversity.be [accessed on 2019-10-14]
  • Colling, G. & Y. Krippel, 2003. Notes floristiques. Observations faites au Luxembourg (2000-2001). Bull. Soc. Nat. luxemb. 103: 3-23. [PDF 342 KB]
  • Lambinon J. & F. Verloove, 2012. Nouvelle flore de la Belgique, du grand-duché de Luxembourg, du Nord de la France et des régions voisines. Sixième édition. Avec la collaboration de L. Delvosalle, B. Toussaint, D. Geerinck, I. Hoste, F. Van Rossum, B. Cornier, R. Schumacker, A. Vanderpoorten et H. Vannerom. Jardin botanique national de Belgique, Meise. CXXXIX + 1195 pp. ISBN : 9789072619884.
  • MNHNL, 2000-. Myriophyllum aquaticum (Vell.) Verdc. in Recorder-Lux, database on the natural heritage of the Grand Duchy of Luxembourg. Musée national d’histoire naturelle, Luxembourg. URL: https://mdata.mnhn.lu [Accessed 2019-10-14]
  • MNHNL, iNaturalist & GBIF, 2019. Myriophyllum aquaticum (Vell.) Verdc. in MNHNL-mdata, online portal combining species observation from Recorder-Lux, iNaturalist and GBIF. National Museum of Natural History, Luxembourg. URL: https://mdata.mnhn.lu [Accessed 2019-10-14]
  • 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, [in prep.]. Risk assessment after the Harmonia+ protocol of invasive alien vascular plant species in Luxembourg.

 Page content last updated on 2019-11-21. Last proofread by Caroline Grounds on 2019-11-20.