Centrifugal partition chromatography, Sephadex LH-20, and ion-pair reversed-phase IC were applied in the isolation of quaternary alkaloids from two Formosan Lauraceous plants: Cryptocarya konishii and Litsea cubeba. These efforts led to the isolation of (+)- (1R,1aR)-1a-hydroxymagnocurarine [1] from C. konishii and three additional quaternary alkaloids, (-)-oblongine [3], (-)-8-O-methyloblongine [4], and xanthoplanine [5], from the stems of L. cubeba, along with (-)-magnocurarine [2]. Of these compounds, 1 and 4 are new natural products and 3 is the levorotatory optical isomer of the known (+)-oblongine. Structures were elucidated by spectral analyses. Despite the intensive investigation of the free bases, few quaternary alkaloids have been reported in Lauraceous plants. In a continuation of studies of polar compounds, we report herein the isolation and characterization of quaternary alkaloids from two Formosan Lauraceous plants, Cryptocarya konishii Hayata ex Kawakami and Litsea cubeba (Lour.) Persoon. The quaternary alkaloids of L. cubeba had been previously studied, and only (-)-magnocurarine [2] was isolated from the stem (1); while those in C. konishii have remained to be investigated.