Aldebaran III was the inhabited third planet orbiting the primary Aldebaran, in the Alpha Quadrant. This planet was located near the Ficus sector. (TOS: "The Deadly Years"; TNG: "Up The Long Ladder", okudagram; DIS: "Magic to Make the Sanest Man Go Mad")
A few years prior to 2267, Janet and Theodore Wallace performed experiments using carbohydrate compounds to slow the aging of plants at the Federation outpost on this planet. (TOS: "The Deadly Years")
See also Edit
Background information Edit
According to StarTrek.com, Aldebaran III was a long-time Federation member. This website, and the Star Trek Encyclopedia (4th ed., vol. 1, p. 16) - in an article about the Aldebaran system - treated Aldebaron III and Aldebaran III as the same planet.