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Rubus ursinus

Species category

Shrub or Tree

Common name

California blackberry

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

D-shaped

Size

  • Length 2.5–3 mm
  • Width 1.2–1.8 mm
  • Thickness 1–1.5 mm

Color

Light brown

Texture

Reticulate

Other structures

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

Identification notes

Seeds often covered with dried fruitFruit:
A mature ovary and any associated parts.
 material.

Noxious weed seed categories

Not listed

AOSA examination list

Not included

Nomenclature

Family

Rosaceae

Valid name

Rubus ursinus Cham. & Schltdl.

Synonyms

Rubus ursinus Cham. & Schltdl. ssp. macropetalus (Douglas ex Hook.) Roy L. Taylor & MacBryde
Rubus macropetalus Douglas ex Hook.
Rubus ursinus Cham. & Schltdl. var. macropetalus (Douglas ex Hook.) S.W. Br.

Rubus ursinus. True seeds are covered with dried fruit material. Photo by Julia Scher, USDA-APHIS-PPQ.
Rubus ursinus. True seeds are covered with dried fruit material. Photo by Julia Scher, USDA-APHIS-PPQ.