Polygonum persicaria L.
  • Sp. Pl.
  • Pfirsichblättriger Knöterich

Cite taxon page as 'WFO (2021): Polygonum persicaria L. Published on the Internet;http://www.worldfloraonline.org/taxon/wfo-0000489142. Accessed on: 18 Oct 2021'

General Information

Herbs annual. Stems erect or ascending, 40-80 cm tall, branched or simple, sparsely pubescent or glabrescent. Petiole 5-8 mm, appressed hispidulous; leaf blade lanceolate or elliptic, often with a dark triangular spot at middle, both surfaces appressed hispidulous, densely so along midvein, base narrowly cuneate, margin largely ciliate, apex acute or acuminate; ocrea tubular, 1-2 cm, membranous, sparsely pubescent, apex truncate, cilia 0.4-3 mm. Inflorescence terminal or axillary, spicate, 2-6 cm, usually several spikes aggregated and panicle-like; peduncle glandular hairy or glabrous; bracts funnel-shaped, ciliate, each 5-7-flowered. Pedicel 2.5-3 mm. Perianth reddish or deep purple, usually 5-parted; tepals oblong, 2.5-3 mm, distinctly veined. Stamens 6 or 7. Styles 2, rarely 3, connate to below middle. Achenes included in persistent perianth, black-brown, shiny or opaque, suborbicular or broadly ovoid, biconvex, rarely trigonous, 2-2.5 mm, smooth. Fl. Jun-Jul, fr. Jul-Sep. 2n = 22, 42.

  • Provided by: [C].Flora Of CHina @ efloras.org
    • Source: [
    • 1
    • ]. 

    "Erect or ascending annual to 8 dm, often much branched, glabrous or nearly so; lvs narrowly lanceolate, often with a dark blotch; ocreae membranous, strigillose, short-ciliate; spikes dense, straight, cylindric, 1–4 cm × 7–12 mm; ocreolae obliquely truncate, entire or with a few short cilia to 1 mm, pedicels mostly included; perianth pink or rose, 2–3.5 mm; achenes lenticular or occasionally trigonous, black, smooth and shining, broadly ovate, 1.8–3 mm, averaging four-fifths as wide; 2n=44. Native of Europe, now a common weed throughout our range, s. to Fla. and Tex., and w. to Alaska and Calif. (P. dubium; P. maculosum; P. puritanorum; Persicaria persicaria)"

  • Provided by: [D].New York Botanical Garden
    • Source: [
    • 2
    • ]. 


    Stängel 20–80 cm, niederliegend bis aufrecht, verzweigt. Blätter lanzettlich, 4–6mal so lang wie breit, meist mit dunklem Fleck, kahl oder unterseits behaart, in den Stiel verschmälert. Blattscheiden mit 1–2(–5) mm langen Haaren. Teilblüt

  • Provided by: [B].Flora Helvetica – Illustrierte Flora der Schweiz
    • Source: [
    • 3
    • ]. 


    7–10. Äcker, Schuttplätze, Gräben, kollin-montan(-subalpin). CH.

  • Provided by: [B].Flora Helvetica – Illustrierte Flora der Schweiz
    • Source: [
    • 3
    • ]. 

    Distribution Map

    • Native distribution
    Found in
    • Southern America Brazil Paraní
    • Rio Grande do Sul
    • Santa Catarina
    • Espirito Santo
    • Minas Gerais
    • Rio de Janeiro
    • São Paulo
    • Brazilia Distrito Federal
    • Goiás

    Other Local Names

    Pfirsichblättriger KnöterichGermanCH
    Renouée persicaireFrenchCH
    Poligono persicariaItalianCH
    Badalestg cun feglia da persicRaeto-RomanceCH


     Information From

    Brazilian Flora 2020 project - Projeto Flora do Brasil 2020
    Brazil Flora G (2014): Brazilian Flora 2020 project - Projeto Flora do Brasil 2020. v393.147. Instituto de Pesquisas Jardim Botanico do Rio de Janeiro. Dataset/Checklist. doi:10.15468/1mtkaw
    • A Group Brazil Flora, REFLORA Program
    Flora Helvetica – Illustrierte Flora der Schweiz
    Flora Helvetica – Illustrierte Flora der Schweiz, Konrad Lauber, Gerhart Wagner, Andreas Gygax. Haupt Verlag 2018.
    • B All Rights Reserved
    Flora Of CHina @ efloras.org
    'Flora of China @ eFloras (2008). Published on the Internet http://www.efloras.org/flora_page.aspx?flora_id=2 [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
    • C Missouri Botanical Garden
    New York Botanical Garden
    Descriptions of plants should be attributed to the full citation for each individual article, chapter or book that is the source for each record, which should include the authors of original publication.
    • D Content licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
    World Flora Online Data. 2017.
    • E CC0 1.0 Universal (CC0 1.0).