Weed Science & Agronomy
INRA-Dijon
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Unité de Malherbologie & Agronomie Weed Science & Agronomy INRA-Dijon |
Bayer Code : bidce
Synonym(s) of Sc. name:
Classification: Compositae, Dicotyledonous
Common name: nodding bur-marigold (GB),nodding beggartricks (U.S.A.)
Synonym(s) of Common name:
Name per country: FR : bidens penché ; IT : forbicina intera ; PT : ; EN : nodding bur-marigold (GB), EN : nodding beggartricks (U.S.A.) ;
Biological type: Annual
- Cotyledons : Lanceolate, at least 10x as long as broad, apex acuminate usually broader in middle than end, more or less long-stalked, gradually narrowing into stalk, otherwise sessile.
- Leaves : Deeply lobed, outline ovate to triangular.
- Height : 10-150 cm.
- Stem : erect, tubulous, glabrous or sparcely hairy, green-yellowish, often branched at base.
- Leaves : sessile or subsessile, opposite ; blade 4-11x0.5-1 cm linear or linear-lanceolate, entire or with sharp-pointed and spaced out teeth.
- Inflorescence : capitulum 2 cm in diameter, disk shaped, on a peduncle recurved downwards at maturity (hence 'nodding'); outer bracts leaf -like, 1-2 cm and spreading; disk-florets without ligules or small (1 cm) and oval ; ray -florets yellow.
- Fruit : achenes 3-4-angled prominent at the apex and prolonged upwards into awns provided with bristles turned downwards.
- Risk of confusion with: Bidens frondosa L.
- Biological type : annual.
Mistake with: Bidens frondosa
Ecological profile (click on flags):
Present
