Rudbeckia laciniata

Species category

Flower

Common name

cut-leaf coneflower, green-headHead:
An inflorescence of stalkless or nearly stalkless flowers attached to a common receptacle that often assumes the appearance of a single flower, but in fact may be a composite of many flowers, e.g. sunflower, clover.
coneflower

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 4–5.5 mm
  • Width 1–1.9 mm
  • Thickness 1–1.9 mm

Color

Gray

Texture

Longitudinal ribs are strong and few with fine striations between ribs.

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. 
crown at the apexApical:
The distal end of the fruit or seed away from the point of attachment or attachment scar.
is the full width 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.
.

Identification notes

The base attachments are somewhat lateral. 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 is light-colored.

Noxious weed seed categories

Not listed

AOSA examination list

Not included

Nomenclature

Family

Asteraceae

Valid name

Rudbeckia laciniata L.

 Rudbeckia laciniata.  Achenes with strong longitudinal ribs that have striations between them.
Rudbeckia laciniata. Achenes with strong longitudinal ribs that have striations between them.