Duboisia spp.

The genus Duboisia comprises of four species: D. hopwoodii is confined to the interior of the Australian continent, D. leichhardtii has a restricted occurrence in the highlands of southeastern QLD, D. myoporoides occurs along the eastern coast of Australia and in New Caledonia and D. arenitensis occurs near Mt Gilruth on the W Arnhem land plateau, NT. The leaves of all four species contain major quantities of alkaloids; but the genus is unique in that one species, D. hopwoodii, contains the pyridine alkaloids nicotine and nor-nicotine, whereas the other three contain various alkaloids of the tropane group.