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Neil Catnip has another name and it's part of the Mint familylike spearmints, peppermints, ordinary mint.,It's Cat Mint. But it is not edible to humans.http://en.wikipedia.org/wiki/Catnip
WARNING - TOTAL SPECULATION AHEADAs Rosalind's wiki link explains, catnip contains insect repellents - it could well be that cats have evolved a 'reward mechanism' for rolling in catnip, just as some monkeys seem to get pleasure from gently biting millipedes and rubbing them in their fur - the millipedes release toxic chemicals which would protect them from predators, and the monkeys use these chemicals as fur-fumigation. (I think this was on a David Attenborough programme, but can't remember which one).So rolling in catnip possibly helps to stave off insects which could otherwise take up residence in their fur, and so cats have evolved to be rewarded for doing so with a feeling of euphoria.END OF SPECULATION