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Tanacetum parthenium

Species category

Flower, Weed

Common name

feverfew

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

Oblanceolate

Size

  • Length 1.2–1.7 mm
  • Width 0.4–0.7 mm
  • Thickness 0.4–0.7 mm

Color

Gray or light yellow

Texture

Rough between ribs

Other structures

Large, closely-spaced longitudinal rib

Identification notes

PappusPappus:
Modified calyx in Asteraceae, composed of hairs, bristles, awns, or scales. The pappus-like structure attached to milkweed seeds is termed a coma. 
 crown composed of scaly points, which are the terminal end of the ribs.

Noxious weed seed categories

Not listed

AOSA examination list

Not included

Nomenclature

Family

Asteraceae

Valid name

Tanacetum parthenium (L.) Sch. Bip.

Synonyms

Chrysanthemum parthenium (L.) Bernh.
Matricaria parthenium L.

Tanacetum parthenium. Achenes with large, closely spaced longitudinal ribs.
Tanacetum parthenium. Achenes with large, closely spaced longitudinal ribs.
Tanacetum parthenium. Achenes with a pappus crown composed of scaly points, which are the terminal ends of the ribs.
Tanacetum parthenium. Achenes with a pappus crown composed of scaly points, which are the terminal ends of the ribs.