Weed Science & Agronomy
INRA-Dijon
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Unité de Malherbologie & Agronomie Weed Science & Agronomy INRA-Dijon |
Bayer Code : polhy
Synonym(s) of Sc. name:
Classification: Polygonaceae, Dicotyledonous
Common name: water-pepper
Synonym(s) of Common name:
Name per country: DE : Wasserpfeffer ; ES : persicaria picante ; FR : renouée poivre d' eau ; IT : poligono pepe d'acqua ; PT : pimenta-de-água ; EN : water-pepper ; NL : ; DK : bidende pileur
Biological type: Annual
.
- Cotyledons elliptic or ovate, rounded tip, more or less stalked.
- Leaves entire, lanceolate, more or less dentate.
- Height: 30-90 cm.
- Stem erect or ascending, branched, sometimes reddish.
- Leaves elongate-lanceolate, regularly attenuate at the base and at the tip, regularly black-dotted, with a peppery taste. Prominent veins, transparent and dotted, glandular. Ochreas nearly glabrous, long-haired.
- Flowers greenish-white, sometimes pink, in long slender spikes, interrupted, somewhat arcuate-hanging. Bracteoles naked. Perianth segments covered with glandular dots.
- Fruit : 2-3 mm, sometimes 3-angled and sometimes biconvex flattened, dull, minutely rugose.
- Plant poisonous. Seeds can be used as a substitute of pepper, the juice of flowers was used against gout.
- Risk of confusion with Polygonum lapathifolium L., Polygonum persicaria L.
- Biological type: annual.
Mistake with: Polygonum lapathifolium , Polygonum persicaria
Ecological profile (click on flags):
Present
Present
Present
Present
