Phytotoxic activity in Flourensia campestris and isolation of (−)-hamanasic acid A as its active principle compound

► Phytotoxic effects of Flourensia campestris was investigated ► Aq. leaf extracts showed strong inhibition on germination and growth of L.sativa. ► The principal phytocompound isolated was (−)-hamanasic acid A. ► Leaf essential oils did not display phytotoxicity and volatiles were characterized. ► High stores and release of 1 strongly suggest its role as allelochemical.