Schoenoplectus acutus

Species category

Revegetation or Rangeland, Weed

Common name

hardstem bulrush, Schoenoplectus

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

ObovateObovate:
Inverted egg shaped with apical end the broadest.

Size

  • Length 1.5–2 mm
  • Width 1.1–1.5 mm
  • Thickness 0.8–1 mm

Color

White to black

Texture

Rough

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.
often has bristled hairs from the base.

Identification notes

The base of the style remains on the apicalApical:
The distal end of the fruit or seed away from the point of attachment or attachment scar.
end.

Noxious weed seed categories

Not listed

AOSA examination list

Not included

Nomenclature

Family

Cyperaceae

Valid name

Schoenoplectus acutus (Muhl. ex Bigelow) Á. Löve & D. Löve

Synonyms

Scirpus acutus Muhl. ex Bigelow
Scirpus lacustris L. p.p.
Schoenoplectus lacustris (L.) Palla ssp. acutus (Muhl. ex Bigelow) Á. Löve & D. Löve

 Schoenoplectus acutus.  Achenes with the base of the style remaining on the apical end.
Schoenoplectus acutus. Achenes with the base of the style remaining on the apical end.