Weed Science & Agronomy
INRA-Dijon
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Unité de Malherbologie & Agronomie Weed Science & Agronomy INRA-Dijon |
Bayer Code : amare
Synonym(s) of Sc. name: Amaranthus spicatus Lamarck, Amaranthus strictus Tenore , Pixidium retroflexum Montand.
Classification: Amaranthaceae, Dicotyledonous
Common name: common amaranth (GB), red-root pig weed (U.S.A.)
Synonym(s) of Common name:
Name per country: DE : Rauhaariger Amarant ; ES : bledo ; FR : amarante réfléchie ; IT : amaranto comune ; PT : moncos-de-peru ; EN : common amaranth (GB), EN : red-root pig weed (U.S.A.) ; NL : papegaaiekruid ;
Biological type: Annual
.
- Cotyledons elliptical, with rounded tip, more or less petiolate.
- Entire leaves, elliptical to ovate with entire margin.
Height: 30-100 cm
- Stem with numerous basal branches, hairy, rose coloured.
- Leaves ovate with distinct hairy petiole, often coloured, first ones opposed then alternate. Indented at top of lamina, terminated with mucron. Margin of lamina hairy.
- Flower regrouped in long terminal spike green yellowish fitted at base of axillary coalescent spike, perianth of 5 linear pieces, spatulate, emarginate with pointed margin.
- Fruit: dehisces transversely.
- Triazine resistant populations exist in France, Austria, Hungary and Canada.
- Risk of confusion with: Amaranthus hybridus L., Amaranthus cruentus L.
- Biological type: annual.
Mistake with: Amaranthus hybridus , Amaranthus cruentus
Ecological profile (click on flags):
Present
Present
Present
Present
Present
Present
