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Fact Sheets

FICHES DE
RENSEIGNEMENTS

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Knautia arvensis (L.) Coult.

Overview
General Information
ID Info
Similar Species
Need ID Help?
Aperçu
Renseignements Généraux
Informations D'identification
Espèces Semblables
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Family :

Famille :

Caprifoliaceae

Synonym(s) :

Synonyme(s) :

Scabiosa arvensis

Common Name(s) :

Nom(s) commun(s) :

Field scabious

Field scabious (Knautia arvensis)  nutlets

  • Field scabious (Knautia arvensis)  nutlets

  • Field scabious (Knautia arvensis)  nutlets

  • Field scabious (Knautia arvensis)  nutlets

  • Field scabious (Knautia arvensis)  nutlet

  • Field scabious (Knautia arvensis) nutlet

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Overview

Aperçu

Regulation :

Remarques Réglementation:

  • ​Quarantine lists of countries e.g. China *may be updated without notice

Regulation Notes:

On quarantine lists of countries e.g. China*.

*Quarantine lists of countries may be updated without notice.

Distribution :

Répartition :

Field scabious is native to Eurasia and naturalized in the Russian Federation and North and South America (USDA-ARS 2017). It is widespread in the northern United States (USDA-NRCS 2017).

Habitat and Crop Association :

Habitat et Cultures Associées :

This species occurs in dry soils, pastures, old fields, roadsides and disturbed areas (Darbyshire 2003).

Economic Use, cultivation area, and Weed Association :

Utilisation économique, zone de culture et association de mauvaises herbes :

Duration of Life Cycle :

Durée du cycle vital:

Perennial

Dispersal Unit Type :

Type d’unité de dispersion :

Nutlet

General Information

RENSEIGNEMENTS GÉNÉRAUX

Field scabious has a deep taproot, is cultivated as a garden ornamental and known for attracting butterflies. It occurs as an occasional weed in most provinces. Also, it competes with forage and pasture land in western Canada (Darbyshire 2003; ISCBC 2014).

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Knautia arvensis flowers (Steve Dewey, Utah State University, Bugwood.org)

Identification

Identification

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  • Nutlet

    Size

    • Nutlet length: 2.7  – 5.7 mm (average: 4.5 mm) ; width: 1.5 –2.9 mm (average: 2.1 mm)

    Shape

    • Nutlet is oblong-shaped, compressed, with a central ridge on each flat face

    Surface Texture

    • Nutlet surface is covered with long hairs and may be densely resin-dotted

    Colour

    • Nutlet is light brown, some have a green wash

    Other Features

    • Nutlet has a light coloured knot of persistent tissue at one end
    • An easily-removed, greenish ring of bristles may be found on the end opposite the tissue knot on immature nutlets

    Field scabious (Knautia arvensis)  nutlets

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Identification Tips

CONSEILS POUR L’IDENTIFICATION

Additional Botany Information

AUTRES RENSEIGNEMENTS BOTANIQUES

Similar Species

ESPÈCES SEMBLABLES

Similar species are based on a study of seed morphology of various species, and those with similar dispersal units are identified. The study is limited by physical specimen and literature availability at the time of examination, and possibly impacted by the subjectivity of the authors based on their knowledge and experience. Providing similar species information for seed identification is to make users aware of similarities that could possibly result in misidentification.

Knautia dipsacifolia (wood scabious)

Knautia dipsacifolia nutlets are a similar oblong shape with truncate ends, hairy and resin-dotted surface texture, light brown colour and a knot of tissue at one end.

Knautia dipsacifolia nutlets may be slightly curved to one side. The nutlets of the two species are similar and difficult to distinguish.  Specimen comparison is recommended for an accurate identification.

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Reference(s)

Référence(s)

Darbyshire, S. J. 2003. Inventory of Canadian Agricultural Weeds. Agriculture and Agri-Food Canada, Research Branch. Ottawa, ON.

Global Biodiversity Information Facility (GBIF) Secretariat. 2022. https://doi.org/10.15468/39omei Accessed via https://www.gbif.org/species/2888808 Accessed December 29, 2022.

Invasive Species Council of BC (ISCBC) 2014. Field scabious. Invasive plants [fact sheets]. http://bcinvasives.ca/invasive-species/identify/invasive-plants/field-scabious Accessed July 25, 2017.

U.S. Department of Agriculture-Agricultural Research Services (USDA-ARS). 2017. Germplasm Resources Information Network (GRIN), https://npgsweb.ars-grin.gov/gringlobal/taxon/taxonomysearch Accessed April 25, 2017.

U.S. Department of Agriculture-Natural Resources Conservation Service (USDA-NRCS). 2017. The PLANTS Database. National Plant Data Team, Greensboro, NC USA. https://plants.usda.gov/home Accessed April 25, 2017.

U.S. Department of Agriculture-Natural Resources Conservation Service (USDA-NRCS). 2022. The PLANTS Database. National Plant Data Team, Greensboro, NC USA. http://plants.usda.gov Accessed December 29, 2022.

Author(s)

AUTEUR(S)

Jennifer Neudorf, Angela Salzl, Ruojing Wang, Karen Castro, Katrina Entwistle

Canadian Food Inspection Agency