 "Nicotiana gossei" and a subspecies of "Nicotiana rosulata" called "Ingulba" are preferred.In a small area west of the Mulligan River in south-western Queensland, a distinct population of "Duboisia hopwoodii", low in nornicotine, has been traditionally used and traded widely.Fresh or dried leaves are broken up, mixed with ash and chewed to form a "quid" (a roll about the size and shape of a cigarette).