Hi Vertigo,
Nepenthes emmarene is a hybrid of ventricosa x khasiana. There's quite a few plants out there, because germination was high. 'Savannah Rose' is a cultivar from the cross, noted for its reddish pink color. Clyde and Bruce named their crosses using orchid breeders logic. All the seedlings were given a grex name, and selected individuals were given cultivar status. According to the rules (available at the ICPS plant cultivar registry), only orchids are allowed to have the entire cross given a name, so they were doing things incorrectly-like the Japanese. Carnivorous plants, like roses or hibiscus, or any other cultivated plant, are only given cultivar status-that is, select individuals from the grex are registered, usually based on some horticulturally desireable characteristic.
Nepenthes hybrid nomenclature is a mess. You almost have to memorize the crosses and where they're from to know what you've got.
Hope this is helpful.
Trent