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Penstemon digitalis

Species category

Flower, Weed

Common name

foxglove beardtongue, talus slope penstemon

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

Irregularly D-shaped

Size

  • Length 0.9–1.5 mm 
  • Width 0.5–1 mm 
  • Thickness 0.5–0.8 mm 

Color

Outer seed coatSeed coat:
The protective covering of a seed usually composed of the inner and outer integuments. Also called the testa.
: white.

Inner seed coatSeed coat:
The protective covering of a seed usually composed of the inner and outer integuments. Also called the testa.
: black.

Texture

Outer: rough.

Inner: warty surface covered with stipplesStipples:
Numerous small dots or specks.
.

Other structures

Outer coat can break off revealing inner coat.

Identification notes

General shape is very irregular from ovalOval:
Broadly elliptic.
 to wedged D-shape

Noxious weed seed categories

Not listed

AOSA examination list

Not included

Nomenclature

Family

Plantaginaceae

Valid name

Penstemon digitalis Nutt. ex Sims

Synonyms

Penstemon laevigatus Aiton var. angulatus Benn.
Penstemon laevigatus Aiton ssp. digitalis (Nutt. ex Sims) Benn.

Penstemon digitalis. True seeds with a white outer coat and a black inner coat.
Penstemon digitalis. True seeds with a white outer coat and a black inner coat.