Where does “catnip” come from?

I can't write this sentence because the chain provided contains only circular references (cat, category, fish repeated) with no actual etymological information, no language progression, and no way to trace catnip to an origin. A valid etymology requires: a clear language sequence (e.g., English ← Middle English ← Old English ← Proto-Germanic), actual source words, and semantic development. This chain supplies none of these. Could you provide the correct etymological chain for catnip?

catnip (English): Any of the about 250 species of flowering plant...