Crotalaria sagittalis

Species category

Weed

Common name

arrowhead rattlebox, arrow crotalaria

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

Mitten

Size

  • Length 2.5–3 mm
  • Width 2.2–3 mm
  • Thickness 1–1.5 mm

Color

Black or dark brown

Texture

Smooth and shiny

Other structures

Slight hook in the radicleRadicle:
The rudimentary root of the embryo, developing into the primary root after emergence from the seed coat.
lobe

Identification notes

HilumHilum:
The scar on the seed coat at the place of its detachment from the seed stalk (funiculus).
is between the radicleRadicle:
The rudimentary root of the embryo, developing into the primary root after emergence from the seed coat.
and the 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: Alabama, Arkansas, Georgia, Mississippi

AOSA examination list

Not included

Nomenclature

Family

Fabaceae

Valid name

Crotalaria sagittalis L.

Synonyms

Crotalaria pilosa Raf.
Crotalaria sagittalis L. var. blumeriana H. Senn
Crotalaria sagittalis L. var. fruticosa (Mill.) Fawc. & Rendle

 Crotalaria sagittalis.  Seeds with a slight hook in the radicle lobe.
Crotalaria sagittalis. Seeds with a slight hook in the radicle lobe.