Trifolium subterraneum

Species category

Agricultural

Common name

subterranean clover

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

OvalOval:
Broadly elliptic.
to orbicular, divergent radicleRadicle:
The rudimentary root of the embryo, developing into the primary root after emergence from the seed coat.

Size

  • Length 2–3 mm 
  • Width 2–2.5 mm 
  • Thickness 1.4–1.6 mm 

Color

Purple 

Texture

Slightly roughened

Other structures

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

Identification notes

There is a distinct hilumHilum:
The scar on the seed coat at the place of its detachment from the seed stalk (funiculus).
indentation between the lobes. Surface has a very slight rough texture. Seed has a circular cross section. RadicleRadicle:
The rudimentary root of the embryo, developing into the primary root after emergence from the seed coat.
is much smaller than 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

Included

More information

For more information, see ISMA fact sheet.

Nomenclature

Family

Fabaceae

Valid name

Trifolium subterraneum L.

 Trifolium subterraneum.  True seeds with a radicle 3/4 the length of the cotyledon lobe and is divergent. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Trifolium subterraneum. True seeds with a radicle 3/4 the length of the cotyledon lobe and is divergent. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.