Telemarius IV

Telemarius IV was the fourth planet in its star system. This planet was located somewhere in the Alpha or Beta Quadrant.

The planet had an acrid atmosphere. A native plant called crystilia grew there which produced a fragrance as a biochemical response to this; the fragrance was pleasant to Humans. (TNG: "In Theory")

This planet was only mentioned in dialogue.
In the script, the planet was called Telemarius III. [1]