Lamium amplexicaule

Species category

Weed

Common name

henbit deadnettle, common henbit, henbit, giraffehead

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

ObovateObovate:
Inverted egg shaped with apical end the broadest.

Size

  • Length 2–2.2 mm 
  • Width 0.8–1 mm 
  • Thickness 0.5–0.7 mm 

Color

Black and brown mottled

Texture

Smooth with raised spots

Other structures

VentralVentral:
Adaxial; of the side of an organ facing the axis (compare dorsal).
side with longitudinal rib separating two flat surfaces

Identification notes

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

Comments

ElaiosomesElaiosome:
A lipid-rich appendage of the seed that serves to attract ants for seed dispersal. It encompasses various seed surface structures, such as arils and caruncles, which can develop from different seed or fruit tissues.
are lipid rich appendages which aid in germinationGermination:
The resumption of active growth by the embryo culminating in the development of a young plant from seed.
of the seed and seed dispersal.

Noxious weed seed categories

Not listed

AOSA examination list

Included

Nomenclature

Family

Lamiaceae

Valid name

Lamium amplexicaule L.

Synonyms

Lamium amplexicaule L. var. album A.L. Pickens & M.C. Pickens

 Lamium amplexicaule.  Black nutlets with brown mottling.
Lamium amplexicaule. Black nutlets with brown mottling.
 Lamium amplexicaule . Ventral view of two nutlets. Elaiosome at bottom. Photo courtesy of USDA-APHIS-PPQ.
Lamium amplexicaule. Ventral view of two nutlets. Elaiosome at bottom. Photo courtesy of USDA-APHIS-PPQ.