A new lupine alkaloid, (—)-ߡ5-dehydromultiflorine [1], was isolated from the viable seeds of Lupinus termis. The unusual lupine alkaloids (—)-multiflorine [2], (+)-augustifoline and (±)-lupanine N-oxide were also isolated, together with (±)-lupanine and (+)-13-hydroxylupanine. The structure of 1 was determined by spectroscopic methods. © 1990, American Chemical Society. All rights reserved.