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Potentilla recta

Species category

Weed

Common name

sulphur cinquefoil

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

LenticularLenticular:
Lens-shaped, circular in outline with convex sides.
 and oval 

Size

  • Length 1 mm
  • Width 0.75 mm
  • Thickness 0.25 mm

Color

Brown, dark brown, surface, ridges, and margin are yellow.

Texture

The brown surface is reticulatedReticulated:
Resembling a net or network, especially having veins, fibers, or lines crossing the surface.  
, with strong ridges and a margin.

Other structures

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

Identification notes

Seed ridges tend to be parallel to the straight portion of the margin containing the hilumHilum:
The scar on the seed coat at the place of its detachment from the seed stalk (funiculus).
. Ridges are narrow and sharp. Immature seeds may not have well-developed ridges.

Noxious weed seed categories

State Noxious Weed: California, Colorado, Montana, Nevada, Utah, Wyoming 

AOSA examination list

Not included

Nomenclature

Family

Rosaceae

Valid name

Potentilla recta L.

Synonyms

Potentilla recta L. var. obscura (Nestler) W.D.J. Koch
Potentilla recta L. var. pilosa (Willd.) Ledeb.
Potentilla recta L. var. sulphurea (Lam. & DC.) Peyr.

Potentilla recta. Seeds with seed ridges that tend to be parallel to the straight portion of the margin containing the hilum.
Potentilla recta. Seeds with seed ridges that tend to be parallel to the straight portion of the margin containing the hilum.