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

Side view: ovateOvate:
Egg-shaped with basal end the broadest.
.

Cross-section: triangular.

Size

• Length 2.2–2.7 mm 
• Width 1.5–1.7 mm 
• Thickness 1.5–1.7 mm 

Color

Black

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.
may be partly or wholly enclosed by sepals.

Family

Polygonaceae

Valid name

Polygonum cuspidatum Siebold & Zucc.

Synonyms

Fallopia japonica (Houtt.) Ronse Decr.
Pleuropterus cuspidatus (Siebold & Zucc.) Moldenke
Pleuropterus zuccarinii (Small) Small
Polygonum cuspidatum Siebold & Zucc. var. compactum (Hook. f.) L.H. Bailey
Polygonum zuccarinii Small
Reynoutria japonica Houtt.