Filters. (botany) A common name for the collective ('herd') of hybrids stemming from a given set of two (more) commonly paired parent species. Grex names are mainly used for orchids and bromeliads, which hybridize easily and are eagerly cultivated. noun.

What is grex used for?

a numerical system for measuring the size of fibers, filaments, or yarns, based on the weight in grams of 10,000 meters of the fibrous material.

How orchids are named?

Orchid names follow a standard format, with the genus name first and then the species or hybrid name, often followed by the name of the specific cultivar, any awards or polyploidy information, and sometimes the plant's parentage information.