When is a Subspecies Name Considered "Official"?

When is a subspecies name of a succulent considered an official designation (and who decides that?), and when is the subspecies name just an informal nickname given by a grower?

Consider Agave Montana, which many growers sell as the subspecies "Baccarat". This page shows the Agave Montana "Baccarat" subspecies name. Many growers are using that, so it appears to be a shared subspecies name, but does it have any official status?

How would we check to see what are all the officially designated subspecies of a given species like Agave Montana?

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