A classification term used primarily in orchid breeding to describe all the progeny resulting from a specific cross between two distinct parent species or hybrids. Breeders use a grex name to group siblings that share the same parentage, even if individual plants look different. It simplifies the naming of complex hybrids in commercial horticulture.
Heard on the job
We registered the new cross as a distinct grex so buyers know exactly what parentage they're getting.