Two new quinolizidine alkaloids, 13-epi-hydroxysparteine [1] and desoxyangustifoline [2], have been isolated from the hitherto uninvestigated species Thenuopsis mongolica. Also, (+)-sparteine, 17-oxosparteine, 5,6-dehydrolupanine, α-isolupanine, (+)-hydroxysparteine, (−)-anagyrine, (−)-thermopsine, (−)-cytisine, and N-methylcytisine have been found. © 1991, American Chemical Society. All rights reserved.