Invernian Herb
From Star Trek : Freedom's Wiki
Invernian herb is a medicinal herb located in remote areas of Invernia II.
In 2351, a young Julian Bashir and his father witnessed the death of a native Ivernian girl who, unknown to them, could have been saved by the Ivernian herb. This incident led Julian Bashir to a career in medicine. (DS9: "Melora")