Oncidium Masterpiece 'Puanani'

[Dorothy]

You did Bolero .. pardon me for not giving you that credit
Grex is the name given to a hybrid, a hybrid's identification or if the hybrid is not registered, the name of it's parents.
For example, Onzelumnia Masterpiece - Masterpiece is the grex.
If a hybrid is unregistered then it takes on it's parent's name as in - Oncidium Luster X Oncidium Ballet - this is also referred to as the hybrid's grex.

[Bolero]

The grex is the hybrid name. So when two plants are hybridised this cross will be given a name.

This name is the grex.