Fimbristylis autumnalis

Species category

Weed

Common name

slender fimbry

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

Three-sided spatulateSpatulate:
Having a narrow base and rounded apex. Pear-shaped.

Size

  • Length 0.5 mm
  • Width 0.3 mm
  • Thickness 0.3 mm

Color

Light to dark brown

Texture

Smooth

Other structures

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.
has a strong style with lateral lumps, three longitudinal ridges, and a basalBasal:
The base of the fruit or seed opposite the apical end.
scar.

Identification notes

AchenesAchene:
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.
are very small and three-sided.

Noxious weed seed categories

Not listed

AOSA examination list

Not included

Nomenclature

Family

Cyperaceae

Valid name

Fimbristylis autumnalis (L.) Roem. & Schult.

Synonyms

Fimbristylis autumnalis (L.) Roem. & Schult. var. mucronulata (Michx.) Fernald
Fimbristylis geminata (Nees) Kunth
Scirpus autumnalis L.

 Fimbristylis autumnalis.  Achenes with a strong style with lateral lumps, three longitudinal ridges, and a basal scar. 
Fimbristylis autumnalis. Achenes with a strong style with lateral lumps, three longitudinal ridges, and a basal scar.