Rosemary is native to the Mediterranean region.
When I first saw the scientific name, "Rosmarinus" struck me as a fake Latin word invented to match the English word, "rosemary" (my suspicions re Latinesque words have been heightened ever since I got my diploma and discovered that it has a fake Latin word for "Connecticut" - "Connecticensus" (or something like that)). Oh, how wrong I was! At least according to thefreedictionary.com, which says that "rosemary" comes from a Middle English word "rosemarine," which was derived from the Latin words "ros marinus."
Phylum/division: Magnoliophyta
Class: Magnoliopsida
Order: Lamiales
Family: Lamiaceae
Genus: Rosmarinus
Species: R. officinalis