The aqueous EtOH extract of aerial parts of Eschscholtzia californica Cham. yielded six flavonol 3-O-glycosides including two new compounds: quercetin 3-O-[alpha-rhamnopyranosyl-(1-4)-alpha-rhamnopyranosyl-(1-6)-beta- glucopyranoside] and isorhamnetin 3-O-[alpha-rhamnopyranosyl-(1-4)-alpha-rhamnopyranosyl-(1-6)-beta- glucopyranoside]. Their structures were established on the basis of spectroscopic studies.