Bidens frondosa L.

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English Beggarticks Status LU: established. 1st record: LU & ITW 1959.
Lëtzebuergesch Schwaarzfriichtegen Duebelzant Status Eur.: established. 1st record: IT 1750-1800.
Français Bident feuillé RA: ISEIA: C2. Harmonia+: 0,18
Deutsch Schwarzfrüchtiger Zweizahn Wikipedia: Wikipedia - English - Beggarticks Wikipedia - Français - Fougère d'eau Wikipedia - Deutsch - Schwarzfrüchtiger Zweizahn Wikipedia - Nederlands - Zwart tandzaad | Wikispecies: Wikispecies - Bidens frondosa | CABI
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Report the species

Report Bidens frondosa to the National Museum of Natural History.

Brief description

Bidens frondosa L. is a pioneer plant species of moist grounds; it colonises river banks, mud flats, ditches, ponds and other open alluvial habitats (Branquart et al. 2019).

Status and distribution in Luxembourg

Records of Bidens frondosa L. in Luxembourg. Data source: Recorder-Lux, iNaturalist & GBIF, 2024-06-25.

Bidens frondosa L. was first documented in Luxembourg by Léopold Reichling and Marcel Etringer on 10th September 1959 on the bank of the Moselle between Stadtbredimus and Hüttermühle, 1 km downstream of the Paul Eyschen Monument, municipality of Stadtbredimus (Reichling 1962; Obs. key: DSS00465000000XF, MNHNL 2000-).

Currently, more than 70 observations of Bidens frondosa are documented, most of them originating in the Moselle valley (MNHNL, iNaturalist & GBIF 2019).

The species is currently expanding to the west of the flora territory (Lambinon & Verloove 2012: 722).

Risk assessment

ISEIA protocol

C2 (2+2+2+1) (Ries et al. 2013: 18).

Harmonia+ protocol

Overall risk score 0,18 = (Overall Invasion score 0,64 x Overall Impact score 0,28) (Ries et al. 2020).


Worldwide distribution


  • Branquart, E., S. Vanderhoeven, W. Van Landuyt, F. Van Rossum, F. Verloove, 2019. Harmonia database: Bidens frondosa L.. Harmonia version 1.2, Belgian Forum on Invasive Species. URL: [accessed on 2019-10-02]
  • CABI, 2014. Bidens frondosa [original text by Ian Popay]. In: Invasive Species Compendium. Wallingford, UK: CAB International. URL: [accessed 2020-02-28]
  • 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-. Bidens frondosa L. in Recorder-Lux, database on the natural heritage of the Grand Duchy of Luxembourg. Musée national d’histoire naturelle, Luxembourg. URL: [Accessed 2019-09-05]
  • MNHNL, iNaturalist & GBIF, 2019. Bidens frondosa L. in MNHNL-mdata, online portal combining species observation from Recorder-Lux, iNaturalist and GBIF. National Museum of Natural History, Luxembourg. URL: [Accessed 2019-09-06]
  • Reichling, L., 1962. Notes floristiques 1959. Bull. Soc. Nat. luxemb. 64: 3-52. [PDF 3155 KB]
  • Ries, C. & Y. Krippel, 2021. First records of 56 invasive alien vascular plants in Luxembourg. Bulletin de la Société des naturalistes luxembourgeois 123: 115-127. [PDF 241 KB]
  • Ries, C., Y. Krippel & M. Pfeiffenschneider, 2020. Risk assessment after the Harmonia+ protocol of invasive alien vascular plant species in Luxembourg. Bull. Soc. Nat. luxemb. 122: 197-205. [PDF 132 KB]
  • 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]

 Page content last updated on 2021-03-02.