Abstract A novel bioside, β-(3′,4′-dihydroxyphenyl)ethyl- O -α- L -rhamnopyranosyl(1 → 3)-D-glucopyranoside, was obtained from the secondary roots of Harpagophytum procumbens . It is accompanied by the known iridoid glucosides harpagoside, procumbide, and its 6′- O -p-coumaroyl ester, and phenolic glycosides, acteoside and isoacteoside, the latter pair being obtained from H. procumbens for the first