Orobanche cooperi

Species category

Weed

Common name

Cooper's broomrape, desert broomrape

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

Irregularly globose

Size

  • Length 0.4–0.6 mm 
  • Width 0.3–0.5 mm 
  • Thickness 0.3–0.5 mm 

Color

Light brown 

Texture

Large reticulations with round interspaces

Other structures

HilumHilum:
The scar on the seed coat at the place of its detachment from the seed stalk (funiculus).
obscure.

Identification notes

Seeds are very small and globose. Seed surface covered with reticulations.

Noxious weed seed categories

Not listed

All species of Orobanche are regulated as plant pests under 7 CFR 330, but not all species are listed on the federal noxious weed list. Learn more about Orobanche spp. and Phelipanche spp. on ITP's Federal Noxious Weed Disseminules tool.

AOSA examination list

Not included

More information

For more information, see ISMA fact sheet, Orobanche and Phelipanche spp.

Nomenclature

Family

Orobanchaceae

Valid name

Orobanche cooperi (A. Gray) A. Heller

Synonyms

Aphyllon cooperi A. Gray
Myzorrhiza cooperi (A. Gray) Rydb.
Orobanche cooperi (A. Gray) A. Heller ssp. cooperi
Orobanche cooperi
(A. Gray) A. Heller ssp. latiloba (Munz) T.S. Collins, ined.
Orobanche ludoviciana Nutt. var. cooperi (A. Gray) G. Beck
Orobanche ludoviciana Nutt. var. latiloba Munz

 Orobanche cooperi.  Small and globose seeds.
Orobanche cooperi. Small and globose seeds.
 Orobanche cooperi.  Deeply reticulate seeds. Photo by Julia Scher, USDA-APHIS-PPQ.
Orobanche cooperi. Deeply reticulate seeds. Photo by Julia Scher, USDA-APHIS-PPQ.
 Orobanche cooperi.  Deeply reticulate seeds. Photo by Julia Scher, USDA-APHIS-PPQ.
Orobanche cooperi. Deeply reticulate seeds. Photo by Julia Scher, USDA-APHIS-PPQ.