I have seen such plants, and understand Mike Kings a collector of every different trait a Sarracenia has so his motivation is different from mine, but I am in no way knocking anyone as it may appear in type. I am not.
I was discussing some of these newly in demand Dionaea cultivars with a old time friend -I don't know half of them. After he described some of these "new" VFT's to me I stated ..."oh the kind we used to get rid of in the 70's because they were all messed up" he said..."exactly"...now they are naming every mutant VFT has some kind of rare cultivar.
Not the exact same case here with Sarracenia.
Some forms of S. flava show this dark green, almost blue look. I don't have the knowledge why, but while its rare its not unheard of and I can find the flava's commonly.
Not so with S. leucophylla it is very rare but often a bland plant in habitat or collection as the colorful S. leucophylla goes, it is a retard., but my view is always the same.
We have a plant that Bob Hanrahan has coined S. minor surprise. It is sweet looking very red and with a wonderful pink flower. How can a S. minor have a pink flower?
This is so rare.
Not really, S. minor and S. psittacina form complicated hybrids regulary. Complex back crossing will give a S. minor a pink flower.
No doubt it is a pretty S. minor with a little S. psittacina still shining through.
Some purist hold no love for hybrids, yet go crazy over a S. leucophylla with a yellow bloom. S. flava x leucophylla back crossed will give your S. leucophylla a yellow bloom.
Still their are anthocyanin free plants, but the dark aqua green S. flava & S. leucophylla I don't think are in this class.
Take care,
Mike
St. Petersburg Florida