Carex hystericina

Species category

Weed

Common name

bottlebrush sedge

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

Top view–ovate

Cross-section–triangular

Size

  • Length: 1.5–6 mm
  • Width: 1.5–2 mm
  • Thickness: 1.5–2 mm

Color

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.
is covered with a papery perigyniumPerigynium:
The saclike bract that subtends the pistillate flower of sedges (Carex), which in fruit becomes a flask-shaped envelope surrounding the fruit (achene).
with a long style.

Identification notes

PerigyniumPerigynium:
The saclike bract that subtends the pistillate flower of sedges (Carex), which in fruit becomes a flask-shaped envelope surrounding the fruit (achene).
with several longitudinal ribs and a long neck, which splits at the apexApical:
The distal end of the fruit or seed away from the point of attachment or attachment scar.
.

Noxious weed seed categories

Not listed

AOSA examination list

Not included

Nomenclature

Family

Cyperaceae

Valid name

Carex hystericina Muhl. ex Willd.

 Carex hystericina.  Achene perigynium has several longitudinal ribs and a long neck, which splits at the apex.
Carex hystericina. Achene perigynium has several longitudinal ribs and a long neck, which splits at the apex.