Verbena lasiostachys

Species category

Weed

Common name

western vervain

Diagnostic characters

Planting unit

NutletNutlet:
A small, dry, indehiscent carpel of a fruit, usually composed of one quarter of the fruit with each enclosing a single seed (e.g. mints).

Shape

Oblong

Size

  • Length 1.6–2 mm
  • Width 0.6–0.9 mm
  • Thickness 0.5–0.6 mm

Color

DorsalDorsal:
Upper side or back of a seed or fruit.
: brown to black.

VentralVentral:
Adaxial; of the side of an organ facing the axis (compare dorsal).
: white to brown.

Texture

DorsalDorsal:
Upper side or back of a seed or fruit.
: rough.

VentralVentral:
Adaxial; of the side of an organ facing the axis (compare dorsal).
: variable tuberculateTuberculate:
Having small pimple-like protuberances.
.

Other structures

The dorsalDorsal:
Upper side or back of a seed or fruit.
side is reticulatedReticulated:
Resembling a net or network, especially having veins, fibers, or lines crossing the surface.  
.

Identification notes

The amount of tubercules on the ventralVentral:
Adaxial; of the side of an organ facing the axis (compare dorsal).
side varies. The two flat surfaces with a central ridge is present on the ventralVentral:
Adaxial; of the side of an organ facing the axis (compare dorsal).
side.

Noxious weed seed categories

Not listed

AOSA examination list

Not included

Nomenclature

Family

Verbenaceae

Valid name

Verbena lasiostachys Link

Synonyms

Verbena lasiostachys Link var. lasiostachys
Verbena lasiostachys Link var. septentrionalis Moldenke
Verbena lasiostachys Link var. scabrida Moldenke
Verbena prostrata W.T. Aiton, non Savi
Verbena robusta Greene

 Verbena lasiostachys.  Nutlets with two flat surfaces with a central ridge present on the ventral side.
Verbena lasiostachys. Nutlets with two flat surfaces with a central ridge present on the ventral side.