The aerial parts of Teucrium yemense yielded four new neo-clerodane di
terpenoids, namely, 6 beta-O-acetyl-3 beta-hydroxyteucroxylepin, teucr
yernin, 19-O-acetylteucryemin and teucryeminone, in addition to the kn
own flavone cirsiliol. The structures of the new compounds were elucid
ated from their spectral data, by chemical derivatization and by compa
rison with closely related compounds.