Multiple realities
(covers information from several alternate timelines)
Mareuvian tea was a type of tea.
In an alternate reality in 2255, Shipyard Bar in Riverside, Iowa, on Earth, offered this tea as a special item on its menu. (Star Trek)
Guinan offered young Wesley Crusher Mareuvian tea while he considered what life would be like away from his mother after she left the Enterprise in 2365. (TNG: "The Child")
According to the script for "The Child", Mareuvian was pronounced "Ma-RU-ve-an." [1]