It's obviously not S.stevensii. see from its pitcher top,especially the top part of tube....compared to S.stevensii.. the external surface of its pitcher has a big different ,which this stain appears much rough and colorful. Its mouth lip varies a bit to the S.stevensii.
it's certainly a hybrid of S.leucophylla.
perhaps some sort of S.rubra...or might be some back crossed sp. or quite complex mixed race.