Unité de Malherbologie & Agronomie Weed Science & Agronomy INRA-Dijon

Bayer Code : crupy

Scientific name: Carduus pycnocephalus L.

Synonym(s) of Sc. name:

Classification: Compositae, Dicotyledonous

Common name: plymouth thistle

Synonym(s) of Common name:

Name per country: DE : Knäuelköpfige Distel ; ES : cardo de calvero ; FR : chardon à capitules serrés ; IT : cardo saettone ; PT : cardo-asnil-italiano ; EN : plymouth thistle ;

Biological type: Annual, Biennial

Seed:

.

Seedling:

- Cotyledons elongated spoon shaped.

- Entire leaves, deeply indented.

Adult plant:

- Height 30-100cm.

- Stem branched, with narrow blade, spiny, naked at top.

- Leaves sinuate or pinnatifid with long spike. Whitish colouration of certain secondary veins.

- Flowers rose( 15-22 mm) in capitulum. Capitulum with average height( 11 to 20 mm), elongated, solitary or 2-3 in a cluster at, extremity of branches clustered.

- Fruits : greyish achenes with silk (2 types of achenes).

- - Risk of confusion with: Carduus tenuiflorus Curtis, Carduus nutans auct.non L., Cirsium spinosissimum (L.) Scop.

- Biological type: annual.

Mistake with: Carduus tenuiflorus

Ecological profile (click on flags):   Present       Present       Rare    

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http://www.dijon.inra.fr/bga/hyppa/hyppa-a/crupy_ah.htm ,