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Rubus argutus

Species category

Weed

Common name

sawtooth blackberry, prickly Florida 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 3–3.2 mm
  • Width 1.8–2 mm
  • Thickness 0.8–1 mm

Color

Yellow with red stains

Texture

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

Other structures

One side of margin is straight, the other curved.

Identification notes

Seed may take on some coloration from fruitFruit:
A mature ovary and any associated parts.
 stain. Reticulations are equilateral at the apicalApical:
The distal end of the fruit or seed away from the point of attachment or attachment scar.
 end but more longitudinal near the base.

Noxious weed seed categories

State Noxious Weed: Hawaii

AOSA examination list

Not included

Nomenclature

Family

Rosaceae

Valid name

Rubus argutus Link

Synonyms

Rubus abundiflorus L.H. Bailey
Rubus betulifolius Small
Rubus floridensis L.H. Bailey
Rubus floridus Tratt.
Rubus incisifrons L.H. Bailey
Rubus louisianus A. Berger
Rubus penetrans L.H. Bailey
Rubus rhodophyllus Rydb.

Rubus argutus. True seeds with some coloration from the fruit stain and reticulations that are equilateral at the apical end but more longitudinal near the base. 
Rubus argutus. True seeds with some coloration from the fruit stain and reticulations that are equilateral at the apical end but more longitudinal near the base.