Heh, don't humans rely on bacteria in their belly for digestion too?
That seems a bit stringent. By the same definition a ruminant mammal is not a true herbivore because it relies on symbiotic bacteria to supply the enzymes necessary to break down plant matter.
Unless herbivory is defined by what you
eat as opposed to how you digest it
Conversely, it seems they're definining protocarnivorous plants by how they
digest what they "eat".
Regardless, your point is not lost.
Edited by Catholic Scientist, : No reason given.