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Cyamopsis tetragonoloba

Species category

Agricultural

Common name

guar, Calcutta-lucerne, cluster-bean, Siam-bean

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 cubic

Size

  • Length 3.5–5 mm
  • Width 3–4.5 mm
  • Thickness 2.2–3.2 mm

Color

Yellow to greenish-tan to black

Texture

Minutely 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).
 flush with the margin, noticeable strophiolar lens.

Identification notes

HilumHilum:
The scar on the seed coat at the place of its detachment from the seed stalk (funiculus).
 small, round, lies flush with seed margin. Color ranges widely from yellow to dark purple or black. RadicleRadicle:
The rudimentary root of the embryo, developing into the primary root after emergence from the seed coat.
 lies along base of seed, often giving a flattened appearance along that side.

Noxious weed seed categories

Not listed

AOSA examination list

Included

Nomenclature

Family

Fabaceae

Valid name

Cyamopsis tetragonoloba (L.) Taubert

Synonyms

Cyamopsis psoralioides DC.

Cyamopsis tetragonoloba. Seeds are yellow to greenish-tan to black. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.
Cyamopsis tetragonoloba. Seeds are yellow to greenish-tan to black. Photo courtesy of Colorado State University, Department of Soil and Crop Sciences.