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The essential oils (EOs) of numerous  Ocimum  species are well-known. The EOs of  O. forskaolii  and  O. americanum  growing naturally in Saudi Arabia are compared chemically in the current study. The GC-MS and GC-FID analysis was used for identification and quantitation of EOs’ chemical components, and the chemometric analysis was used to determine the differences between the two species. Additionally, against the weeds  Dactyloctenium aegyptium  and  Chenopodium murale , the allelopathic potentiality of the two EOs was assessed. Fifty-one compounds were assigned as overall  O. forskaolii  EO’ components, with abundance of mono- and sesquit-terpenes (40.49 and 55.15%, respectively).  endo -Fenchol (18.15%),  tau -cadinol (11.42%), β-atlantol (10.54%), α-eudesmol (7.29%), and α-terpineol (6.94%) were the major components. Sixty-one components were identified via the GC-MS analysis of  O. americanum  EO, with sesquiterpenes (81.24%) serving as the major class. α-Bulnesene (10.17%), germacrene B (7.72%),  endo -borneol (5.51%), isoshyobunone (5.37%), and γ-eudesmol (5.31%) represented the main compounds. Chemometric study showed a distinct difference between the two species’ chemical make-up of the EOs, which might be attributed to genetic changes. The extracted EOs of  O. forskaolii  and  O. americanum  demonstrated a significant allelopathic effect against the weeds  D. aegyptium  and  C. murale . Compared to  O. americanum ,  O. forskaolii  EO demonstrated greater allelopathic activity. The main components of each species may be a candidate for the observed allelopathic activity, which may act singularly or in combination.

Insights into the chemical composition of Ocimum forskaolii and O. americanum essential oils and their phytotoxicity