Asperugo procumbens

Species category

Weed

Common name

German-madwort

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

ObovateObovate:
Inverted egg shaped with apical end the broadest.
to spatulateSpatulate:
Having a narrow base and rounded apex. Pear-shaped.

Size

  • Length: 0.6–0.7 mm
  • Width: 0.4–0.5 mm
  • Thickness: 0.3–0.4 mm

Color

Gray and black mottled

Texture

Tubercles irregular and totally cover seed surface.

Other structures

HilumHilum:
The scar on the seed coat at the place of its detachment from the seed stalk (funiculus).
on margin above base

Identification notes

HilumHilum:
The scar on the seed coat at the place of its detachment from the seed stalk (funiculus).
is large (approximately one-fourth the length of the seed) with a strong margin.

Noxious weed seed categories

Not listed

AOSA examination list

Not included

Nomenclature

Family

Boraginaceae

Valid name

Asperugo procumbens L.

 Asperugo procumbens . Tubercles are irregular and totally cover the seed surface.
Asperugo procumbens. Tubercles are irregular and totally cover the seed surface.
Comparison of  Aspergo procumbens  and  Melissa officinalis.  Photo by Michael K. Kirkpatrick, USDA-APHIS-PPQ.
Comparison of Aspergo procumbens and Melissa officinalis. Photo by Michael K. Kirkpatrick, USDA-APHIS-PPQ.