Thermopsis divaricarpa

Species category

Weed

Common name

spreadfruit goldenbanner, prairie thermopsis, goldenpea

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

OvateOvate:
Egg-shaped with basal end the broadest.
to reniform (kidney-shaped) with divergent radicleRadicle:
The rudimentary root of the embryo, developing into the primary root after emergence from the seed coat.

Size

  • Length 4–5.5 mm 
  • Width 2.5–3.9 mm 
  • Thickness 1.5–2 mm 

Color

Brown to black with some dark mottling

Texture

Smooth

Other structures

HilumHilum:
The scar on the seed coat at the place of its detachment from the seed stalk (funiculus).
is large with surrounding collar, often with an adhering arilAril:
An outgrowth of the ovule or funiculus.
.

Identification notes

RadicleRadicle:
The rudimentary root of the embryo, developing into the primary root after emergence from the seed coat.
lobe is one-fourth the length of the cotyledonCotyledon:
The modified storage leaf or pair of leaves of an embryo and seedling (see primary leaf).
lobe.

Noxious weed seed categories

Not listed

AOSA examination list

Not included

Nomenclature

Family

Fabaceae

Valid name

Thermopsis divaricarpa A. Nelson

Synonyms

Thermopsis montana Nutt. var. divaricarpa (A. Nelson) Dorn
Thermopsis pinetorum Greene
Thermopsis rhombifolia (Nutt. ex Pursh) Nutt. ex Richardson var. divaricarpa (A. Nelson) Isely

 Thermopsis divaricarpa.  True seeds with a large hilum with a surrounding collar, often with an adhering aril. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Thermopsis divaricarpa. True seeds with a large hilum with a surrounding collar, often with an adhering aril. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
 Thermopsis divaricarpa.  True seeds with a large hilum.
Thermopsis divaricarpa. True seeds with a large hilum.