The bottom line here, kath, is that the International Carnivorous Plant Society is the registering authority for any named varieties of carnivorous plants. Pyro is right in that the ICPS has determined that it the use of 'latinized' hybrid names, or even cultivar names for that matter, is not allowed.
Latinized hybrid names are commonly used in other branches of horticulture, like orchids. However, this is not acceptable for CPs.If you want to check on any names you hear, the best resource is the CP Database, which can be viewed/searched at
http://www.omnisterra.com/bot/cp_home.cgi.
As far as the hybrids oyu have mentioned, they should all be referred to by their parentage, as has already been stated. For example, S. oreophila crossed with S. purpurea should be referred to as S. (oreophila x purpurea).
There are certain natural hybrids which were given latinized hybrid names early on, and these were maintained because of their widespread usage. For example, S. alata crossed with S. leucophylla is called S. areolata. d' Amato's book The Savage Garden has a list of accepted natural hybrid names.
Also, remember that not all information on the web is factual. It's unfortunate when people subscribe to the incorrect information; but at least you are on a forum where there are knowledgeable people who can help you in your quest for FACTUAL information! : )
Regards,
Mike