For David Seth Moltz, what started as an obsession to re-create a bay rum he snapped up from a Harvard Square tobacco shop four years ago led to D.S. & Durga, a fragrance line he founded with his wife, Kavi Ahuja Moltz. David conjures up the frontier with names like Mississippi Medicine and Cowgirl Grass in their Brooklyn studio, while Kavi (nicknamed Durga by her husband) designs the bottles and labels. “Perfume is so dominated by Europe,” David says. “We have such awesome plants of our own, and I just wanted to highlight those.” This fall D.S. & Durga is teaming up with perfumer Joya for a scent with a top note of staghorn sumac tree and an accord of “prairie air.” American, indeed (dsanddurga.com; $120).