Spermacoce assurgens

Species category

Weed

Common name

woodland false buttonweed

Diagnostic characters

Planting unit

True seedTrue seed:
A mature fertilized ovule consisting of an embryo, with or without and external food reserve (e.g., endosperm) enclosed by the testa.

Shape

OvalOval:
Broadly elliptic.

Size

  • Length 1–1.2 mm
  • Width 0.4–0.5 mm
  • Thickness 0.3–0.4 mm

Color

Brown to red

Texture

Reticulate

Other structures

The ventralVentral:
Adaxial; of the side of an organ facing the axis (compare dorsal).
side is hollow with enrolled edges lined with yellow grains.

Identification notes

Reticulum rows are longitudinally oriented.

Noxious weed seed categories

Not listed

AOSA examination list

Not included

Nomenclature

Family

Rubiaceae

Valid name

Spermacoce assurgens Ruiz & Pav.

Synonyms

Borreria laevis auct. non (Lam.) Griseb.
Spermacoce remota Lam.
Spermacoce suffrutescens Jacq.

 Spermacoce assurgens.  True seeds with a hollow ventral side, with enrolled edges lined with yellow grains. Photo by Julia Scher, USDA-APHIS-PPQ.
Spermacoce assurgens. True seeds with a hollow ventral side, with enrolled edges lined with yellow grains. Photo by Julia Scher, USDA-APHIS-PPQ.