Parthenium integrifolium

Species category

Herb or Spice

Common name

wild quinine, American 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

ObovateObovate:
Inverted egg shaped with apical end the broadest.

Size

  • Length 3–3.3 mm
  • Width 1.6–1.8 mm
  • Thickness 1.5–1.6 mm

Color

Gray

Texture

Striate with woolly apexApical:
The distal end of the fruit or seed away from the point of attachment or attachment scar.

Other structures

Various attachments enclose 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.
.

Identification notes

Attachments may enclose 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.
or be stick-like structures from the apexApical:
The distal end of the fruit or seed away from the point of attachment or attachment scar.
.

Noxious weed seed categories

Not listed

AOSA examination list

Not included

Nomenclature

Family

Asteraceae

Valid name

Parthenium integrifolium L.

 Parthenium integrifolium.  Achenes enclosed within attachments.
Parthenium integrifolium. Achenes enclosed within attachments.