Isocoma veneta

Species category

Weed

Common name

jimmyweed

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

Lanceolate 

Size

  • Length 2.5–2.8 mm 
  • Width 0.6–0.8 mm 
  • Thickness 0.6–0.8 mm 

Color

Light brown

Texture

PubescentPubescent:
Having hairs.

Other structures

PappusPappus:
Modified calyx in Asteraceae, composed of hairs, bristles, awns, or scales. The pappus-like structure attached to milkweed seeds is termed a coma. 
is long, silky and, abundant.

Identification notes

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.
narrows at the basalBasal:
The base of the fruit or seed opposite the apical end.
half.

Noxious weed seed categories

Not listed

AOSA examination list

Not included

Nomenclature

Family

Asteraceae

Valid name

Isocoma veneta (Kunth) Greene

Synonyms

Haplopappus venetus (Kunth) S.F. Blake

 Isocoma veneta.  Pubescent achenes with a long, silky, and abundant pappus. Photo by Julia Scher, USDA-APHIS-PPQ.
Isocoma veneta. Pubescent achenes with a long, silky, and abundant pappus. Photo by Julia Scher, USDA-APHIS-PPQ.