A novel dimeric quinolone alkaloid, geijedimerine (7), and the monomeric quinolones, 4'-hydroxy-3',4'-dihydroflindersine (2) and cis-3',4'-dihydroxy-3',4,-dihydroflindersine (5), have been isolated from Geijera balansae (Rutaceae) leaves. Their structures have been elucidated by spectral analysis and chemical correlations. In addition, eight other alkaloids and seven neutral products have been isolated from the wood, bark, and leaves of the same species. © 1985, American Chemical Society. All rights reserved.