Medicago orbicularis

Species category

Agricultural, Weed

Common name

blackdisk medick, large-disc medic, button-clover, miegla de caracolillo, Button burclover

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

Triangular 

Size

  • Length 1.8–2 mm
  • Width 1.8–2.3 mm
  • Thickness 0.5–0.8 mm

Color

Black and brown

Texture

TuberculateTuberculate:
Having small pimple-like protuberances.

Other structures

HilumHilum:
The scar on the seed coat at the place of its detachment from the seed stalk (funiculus).
is at tips of 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 at the margin corner.

Identification notes

Deep groove 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.

Noxious weed seed categories

State Noxious Weed: Arizona 

AOSA examination list

Not included

Nomenclature

Family

Fabaceae

Valid name

Medicago orbicularis (L.) Bartal.

Synonyms

Medicago orbicularis (L.) Bartal. var. marginata (Willd.) Benth

 Medicago orbicularis.  Seeds with a deep groove between the radicle and the cotyledon lobes, with the hilum at the tips of the radicle.
Medicago orbicularis. Seeds with a deep groove between the radicle and the cotyledon lobes, with the hilum at the tips of the radicle.