Involved in the biosynthesis of the acyclic monoterpene S-linalool, a major component of the strong sweet scent of the C.breweri flowers. (2E)-geranyl diphosphate + H2O = (S)-linalool + diphosphate Binds 3 Mg(2+) or Mn(2+) ions per subunit. Highly expressed in cells of the transmitting tract of the stigma and style and in the epidermal cells of petals, as well as in stamens. The Asp-Asp-Xaa-Xaa-Asp/Glu (DDXXD/E) motif is important for the catalytic activity, presumably through binding to Mg(2+). Belongs to the terpene synthase family.