We have investigated the epigeal part of H. bucharicum collected in the fruit-bearing period (June 28-July 3, 1970) in the environs of Dekhkanabad, Kashkadar'inskaya oblast UzbSSR. The dry comminuted plant (85 kg) was wetted with 8% ammonia and extracted with chloroform. After the removal of the bucharaine [1] that had deposited (0.36% of the weight of the dry plant), the alkaloids were extracted from the concentrated chloroform extract (A) with 10% sulfuric acid. This gave the combined bases (0.04%), from which treatment with acetone isolated skimmianine [1] (0.009%). The dried acetone mother liquor was chromatographed first through alumina and then through silica gel. Ether eluates yielded a new base (I), with the composition C19H23NO2 mp 126°C (ethyl acetate), mol. wt. 297 (mass spectrometry) which we have called haplobucharine. The alkaloid is readily soluble in organic solvents and dilute acids. On TLC in the toluene-ethyl acetate-formic acid (5:4:1) system it gives a single spot with Rf 0.55, it does not fluoresce in UV light, and it is revealed with the Dragendorff reagent. Spectral analyses (IR, UV, mass, NMR) confirmed haplobucharine's 4-quinolone structure with an isopentyl group on the nitrogen atom. The remaining chloroform extract (A) after drying was separated into basic, acidic, and neutral fractions. From the acid fraction by chromatography we obtained bucharidine [1] (0.03%), and from the neutral fraction bucharaine [1] (0.004%) and flindersine [7] (0.007%). This is the first time that flindersine has been detected in this plant.