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Heliopsis helianthoides

Species category

Flower, Weed

Common name

smooth oxeye

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

Conical

Size

  • Length 4–4.6 mm
  • Width 1–1.5 mm
  • Thickness 1–1.5 mm

Color

Black and brown

Texture

Rough

Other structures

Strong longitudinal ribs

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 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.
. BasalBasal:
The base of the fruit or seed opposite the apical end.
 attachment is large and centered.

Noxious weed seed categories

Not listed

AOSA examination list

Not included

Nomenclature

Family

Asteraceae

Valid name

Heliopsis helianthoides (L.) Sweet

Heliopsis helianthoides. Achenes with a pappus crown that is the full width of the achene, and the basal attachment is large and centered.
Heliopsis helianthoides. Achenes with a pappus crown that is the full width of the achene, and the basal attachment is large and centered.
Heliopsis helianthoides. Achenes with a pappus crown that is the full width of the achene, and the basal attachment is large and centered.
Heliopsis helianthoides. Achenes with a pappus crown that is the full width of the achene, and the basal attachment is large and centered.