Cattleya alliance

[SouthPark]

I've been searching online about information about the term 'Cattleya alliance'.

It does say that it involves some genera of orchids, and Cattleya is one of those.

Anyone know if the 'alliance' term is due to those genera generally being compatible - ie. can be crossed with the plants from the Cattleya genus? And also maybe just crossed with each other in general.

Is that what the 'alliance' part means? Just asking, because I was thinking about orchids that used to be called Cattleya bowringiana, and Cattleya skinneri etc. And now they changed their genus to Gurianthe - due to DNA related reasons. So those plants are now re-badged as Gurianthe bowringiana and Gurianthe skinneri. I don't mind what they did - as people only know more these days, with better technology - DNA testing etc.