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Polygonum argyrocoleon

Species category

Weed

Common name

silversheath knotweed, Persian knotweed

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

Triangular and ovateOvate:
Egg-shaped with basal end the broadest.

Size

  • Length 2–2.2 mm 
  • Width 1–1.2 mm 
  • Thickness 1–1.2 mm 

Color

Reddish-brown

Texture

Smooth

Other structures

ApexApical:
The distal end of the fruit or seed away from the point of attachment or attachment scar.
 pointed

Identification notes

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.
 with two sides slightly smaller than the third. The corner ridges are rounded.

Noxious weed seed categories

Not listed

AOSA examination list

Not included

Nomenclature

Family

Polygonaceae

Valid name

Polygonum argyrocoleon Steud. ex Kunze

Polygonum argyrocoleon. Achenes with a pointed apex.
Polygonum argyrocoleon. Achenes with a pointed apex.
Polygonum argyrocoleon. Achenes with two sides that are slightly smaller than the third. 
Polygonum argyrocoleon. Achenes with two sides that are slightly smaller than the third.