Pycnanthemum flexuosum

Species category

Weed

Common name

Appalachian mountainmint

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

OvalOval:
Broadly elliptic.

Size

  • Length 0.9–1 mm 
  • Width 0.4–0.5 mm 
  • Thickness 0.3–0.4 mm 

Color

Light or dark brown

Texture

GranularGranular:
Resembling or consisting of small grains or particles.
and striate

Other structures

There is a large V-shaped attachment area at the base.

Identification notes

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).
rounded on dorsalDorsal:
Upper side or back of a seed or fruit.
side and flat on 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

Lamiaceae

Valid name

Pycnanthemum flexuosum (Walter) Britton, Sterns & Poggenb.

Synonyms

Koellia hugeri Small
Koellia hyssopifolia
(Benth.) Britton
Pycnanthemum hyssopifolium
Benth.

 Pycnanthemum flexuosum.  Nutlets that are rounded on the dorsal side and flat on the ventral side. 
Pycnanthemum flexuosum. Nutlets that are rounded on the dorsal side and flat on the ventral side.