512. DUBOISIA.—DUBOISIA. The leaves of Duboi'sia myoporoi'des R. Brown, a tall Australian shrub or small tree. The medicinal qualities of the leaves make the plant related to hyoscyamus and other narcotic plants of this order Lanceolate, 75 to 100 mm. (3 to 4 in.) long and 12 to 25 mm. (½ to 1 in.) broad, tapering below into a short petiole; midrib prominent; margin entire; they are generally seen, however, in broken fragments of a brownish-green color; inodorous; taste bitter. They contain duboisine (a mixture of hyoscyamine and atropine), and their action is, therefore, nearly identical with that of belladonna, except that they are less of a cerebral excitant and more calmative and hypnotic.