Senecio atratus

Species category

Flower, Weed

Common name

tall blacktip ragwort

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 3.7–4.5 mm 
  • Width 0.6–0.9 mm 
  • Thickness 0.6–0.9 mm 

Color

Light gray 

Texture

Ribs that are longitudinal and irregular

Other structures

There is a circumferential constriction below the 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 and above the base.

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 may have remnants of pappusPappus:
Modified calyx in Asteraceae, composed of hairs, bristles, awns, or scales. The pappus-like structure attached to milkweed seeds is termed a coma. 
on its margin.

Noxious weed seed categories

Not listed

AOSA examination list

Not included

Nomenclature

Family

Asteraceae

Valid name

Senecio atratus Greene

 Senecio atratus.  Achenes with circumferential constriction below the pappus crown and above the base. 
Senecio atratus. Achenes with circumferential constriction below the pappus crown and above the base.