<jats:p> Examination of this plant has disclosed the presence of ten alkaloids, five of which, namely, protopine (0.15%), cryptopine (0.004%), α-allo-cryptopine (0.001%), bicuculline (0.20%), and scoulerine (0.06%) are well known. A sixth proved to be identical with capnoidine (0.002%), an alkaloid hitherto found only in Corydalis sempervirens. Two of the remaining four, corlumine (0.12%) and corlumidine (0.02%), have been adequately characterized as phthalide isoquinolines and their respective constitutions determined in whole or in part. The last two appear to be new and are designated by Greek letters, namely, -η (0.002%), m.p. 180 °C., probably isomeric with adlumine and corlumine, and -θ (0.002%), m.p. 183 °C., C<jats:sub>16</jats:sub>H<jats:sub>17</jats:sub>O<jats:sub>3</jats:sub>N. The yield of pure crystallized total alkaloids was 0.56%.