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Descurainia pinnata

Species category

Weed

Common name

western tansymustard

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

Compressed ovalOval:
Broadly elliptic.

Size

  • Length 1 mm
  • Width 0.5 mm
  • Thickness 0.3 mm

Color

Brown

Texture

Longitudinal rows of small tubercles

Other structures

Weak longitudinal groove between the radicleRadicle:
The rudimentary root of the embryo, developing into the primary root after emergence from the seed coat.
 and cotyledonCotyledon:
The modified storage leaf or pair of leaves of an embryo and seedling (see primary leaf).
 lobes

Identification notes

Seeds are compressed ovals. The seed coatSeed coat:
The protective covering of a seed usually composed of the inner and outer integuments. Also called the testa.
 is covered with longitudinal rows of small reticulations. No strong indentation between radicleRadicle:
The rudimentary root of the embryo, developing into the primary root after emergence from the seed coat.
 and cotyledonCotyledon:
The modified storage leaf or pair of leaves of an embryo and seedling (see primary leaf).
 lobes. Color is brown.

Noxious weed seed categories

Not listed

AOSA examination list

Not included

Nomenclature

Family

Brassicaceae

Valid name

Descurainia pinnata (Walter) Britton

From Left to Right: 1. Descurainia sophia 2. Descurainia pinnata 3. Capsella brusa-pastoris . Seeds do not have an indentation between the radicle and cotyledon lobes.
From Left to Right: 1. Descurainia sophia 2. Descurainia pinnata 3. Capsella brusa-pastoris. Seeds do not have an indentation between the radicle and cotyledon lobes.
Descurainia pinnata. Seeds with longitudinal rows of small tubercles. 
Descurainia pinnata. Seeds with longitudinal rows of small tubercles.