Weed Science & Agronomy
INRA-Dijon
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Unité de Malherbologie & Agronomie Weed Science & Agronomy INRA-Dijon |
Bayer Code : polav
Synonym(s) of Sc. name: Polygonum heterophyllum Lindman, Polygonum littorale auct.
Classification: Polygonaceae, Dicotyledonous
Common name: knot-grass
Synonym(s) of Common name:
Name per country: DE : Vogelknöterich ; ES : cien nudos ; FR : renouée des oiseaux ; IT : correggiola ; PT : sempre-noiva ; EN : knot-grass ; NL : varkensgras, NL : weggras ; DK : vej-pileur
Biological type: Annual
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- Cotyledons elliptic, clavated tip, more or less stalked.
- Leaves entire, lanceolate, more or less dentate.
- Height: 10-60 cm. Plant very variable.
- Stems slender, numerous, very often spreading, glaucous, branched.
- Leaves elliptic-lanceolate, alternate, with a membranous sheath lacerate at the apex (ochrea ), rolled cigar-like above. Short petiole. Early development of cotyledon and axillary buds.
- Flowers white or pink, sessile, isolated or 2-4 axillary of leaves. 7 stamens and 3 free styles.
- Fruit 3-angled, brown, dull, lengthwise striate, when ripe not exceeding the calyx circa 2.5 mm long.
- Plant astringent, vulnerary and hemostatic. Seeds emetic and purgative. Leaves used as infusion in intestinal disorders. Populations exist which are resistant to triazines in U.S.A. and Poland.
- Biological type: annual.
Ecological profile (click on flags):
Present
Present
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