Weed Science & Agronomy
INRA-Dijon
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Unité de Malherbologie & Agronomie Weed Science & Agronomy INRA-Dijon |
Bayer Code : polla
Synonym(s) of Sc. name: Polygonum nodosum Pers., Polygonum scabrum Moench , Polygonum linicola Sutulov
Classification: Polygonaceae, Dicotyledonous
Common name: pale persicria
Synonym(s) of Common name:
Name per country: DE : Ampfer-Knöterich ; ES : persicaria mayor ; FR : renouée à feuilles de patience ; IT : poligono nodoso ; PT : mal-casada ; EN : pale persicria ; NL : beklierde duizendknoop, NL : witte smerte ; DK : knudet pileurt
Biological type: Annual
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- Cotyledons elliptic or ovate, rounded tip, more or less stalked.
- Leaves entire, lanceolate, more or less dentate.
- Height: 30-100 cm.Plant glabrous to pubescent.
- Stem erect and branched, olive-greenish often red-tinged.
- Leaves pinnately veined, with a maximal width at the lower 1/3 of the blade. Leaves lanceolate attenuate into a short petiole. Whitish hairiness, tomentose, beneath the blade, less abundant on the upper leaves closed to the inflorescence. Ochreas hairy to glabrous, without hairs or with short hairs.
- Flowers greenish-white or pink in oblong spikes. 6 stamens and 2 styles separate to the base and reflexed.
- Fruits 2-3 mm, all suborbicular biconcave, smooth, shining, flattened.
- Populations exist which are resistant to triazines in France, Germany, Czechoslovakie, Holland.
- Biological type: annual.
Mistake with: Polygonum persicaria , Polygonum hydropiper , Polygonum amphibium (at seedling stage).
Ecological profile (click on flags):
Present
Present
Present
Present
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