Honeysuckle was a plant on Earth with fleshy and sweetly-scented flowers.
In 2268, Captain Kirk, and other landing party members on Argus X and Tycho IV compared the odor of the Dikironium cloud creature to that of strong, bittersweet honeysuckle. (TOS: "Obsession")
The same year, on the planet of Amerind, Doctor McCoy swore that he could smell honeysuckle. (TOS: "The Paradise Syndrome")
