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Anthemis arvensis

Species category

Weed

Common name

corn chamomile

Diagnostic characters

Planting unit

AcheneAchene:
A dry, hard, one-chambered, one-seeded indehiscent fruit, as in buckwheat (Fagopyrum) or sunflower (Helianthus). The fruit wall is not united with the seed coat.

Shape

Cylindrical to obovateObovate:
Inverted egg shaped with apical end the broadest.

Size

  • Length: 2.5 mm
  • Width: 1 mm
  • Thickness: 1 mm

Color

Yellow

Texture

Strong ribs with no interspace. ReticulationReticulated:
Resembling a net or network, especially having veins, fibers, or lines crossing the surface.  
 over the entire acheneAchene:
A dry, hard, one-chambered, one-seeded indehiscent fruit, as in buckwheat (Fagopyrum) or sunflower (Helianthus). The fruit wall is not united with the seed coat.
.

Other structures

Pointed base and a squared apexApical:
The distal end of the fruit or seed away from the point of attachment or attachment scar.

Identification notes

Shoulders of the apexApical:
The distal end of the fruit or seed away from the point of attachment or attachment scar.
 squared. Sharp, pointed base. Longitudinal ribs wide, leaving no interspaces. There is a fine reticulatedReticulated:
Resembling a net or network, especially having veins, fibers, or lines crossing the surface.  
 texture that covers the surface of the acheneAchene:
A dry, hard, one-chambered, one-seeded indehiscent fruit, as in buckwheat (Fagopyrum) or sunflower (Helianthus). The fruit wall is not united with the seed coat.
.

Noxious weed seed categories

State Noxious Weed: Colorado

AOSA examination list

Included

Nomenclature

Family

Asteraceae

Valid name

Anthemis arvensis L.

Synonyms

Anthemis arvensis L. var. agrestis (Wallr.) DC.

Anthemis arvensis.  Shoulders of the apex squared and sharp, pointed base; longitudinal ribs wide, leaving no interspaces. There is a fine reticulated texture that covers the surface of the achene.
Anthemis arvensis. Shoulders of the apex squared and sharp, pointed base; longitudinal ribs wide, leaving no interspaces. There is a fine reticulated texture that covers the surface of the achene.
Anthemis arvensis.  Cylindrical to obovate achene. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Anthemis arvensis. Cylindrical to obovate achene. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.