abstract the essential oils isolated by steam distillation from the leaves and roots of senecio rufinervis dc., were analyzed by gc, gc/ms and 1h- and 13c-nmr. a total of (92.5%) and (89.1%) of the constituents were identified in leaf and root oil, respectively. both the oils were dominated by the sesquiterpenoids with germacrene d (33.7%), -cadinene (5.5%), -cadinene (5.5%), germacrene d-4-ol (5.4%), -cadinol (4.9%) and -longipinene (4.0%) as major constituents in leaf oil while germacrene d (32.9%), germacrene a (19.5%), -elemene (7.6%), -cubebene (4.9%) and -eudesmol (3.0%) were dominant in the root oil.